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XO, Katie Rosario

26 DIY Under the Sea Mermaid Party Ideas

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Planning a mermaid party? If you weren’t before, you’ll want to now!

Mermaids are so popular right now, which is amazing because there are so many ideas to have your own DIY party. I mean, what little kid wouldn’t love celebrating their birthday in a magical underwater grotto?

Many of these ideas are so easy to make at home and very doable especially on a budget. Here are some of the cutest mermaid party ideas I’ve seen.

Let’s Party!

  1. Mermaid Invitations

mermaid birthday party custom etsy invitations. Who doesn't love mermaids?! This is genius! So perfect for kids birthday parties! Under the sea and the little mermaid as a party is awesome! So many DIY ideas that are easy and cheap. Which is even better since we done want to break our budgets throwing a mermaid party. I like the food, dessert, decorating, activity ideas! Love it saving it for later!

Found from Etsy

To planning an awesome party, everything starts with the invitation. This teal, purple and gold mermaid party invitation from Lemonade Design Studio is certain to make a splash! I love the watercolor effect of the design.

  1. Let’s Be Mermaids Dessert Table

Mermaid birthday party DIY ideas. Dessert table. Who doesn't love mermaids?! This is genius! So perfect for kids birthday parties! Under the sea and the little mermaid as a party is awesome! So many DIY ideas that are easy and cheap. Which is even better since we done want to break our budgets throwing a mermaid party. I like the food, dessert, decorating, activity ideas! Love it saving it for later!

Found from Happy Wish Company

Start the party right with a focal point of the party. Use different size balloons to make an arch, use streamers to create the ocean come alive. Make cakes, cupcakes, and other fun desserts to bring this table alive. I love the colors! So beautiful!

  1. Vintage Shell Mermaid Letter Sign

Custom Mermaid letters vintage sea shell sign for DIY under the sea mermaid birthday party. Who doesn't love mermaids?! This is genius! So perfect for kids birthday parties! Under the sea and the little mermaid as a party is awesome! So many DIY ideas that are easy and cheap. Which is even better since we done want to break our budgets throwing a mermaid party. I like the food, dessert, decorating, activity ideas! Love it saving it for later!

Found from Kara’s Party Ideas

This is a great idea and something that your child can keep in their room! Have the kids help decorate it by gluing shells onto the wooden letters. What’s great is rather than buying shells go gather shells on the beach, add some pretty jewels and glitter to brighten the letter up!

  1. Mermaid Paper Lanterns

Pastel paper lanterns. DIY under the sea mermaid birthday party idea. Who doesn't love mermaids?! This is genius! So perfect for kids birthday parties! Under the sea and the little mermaid as a party is awesome! So many DIY ideas that are easy and cheap. Which is even better since we done want to break our budgets throwing a mermaid party. I like the food, dessert, decorating, activity ideas! Love it saving it for later!

Found from Republic of Party

This is a wonderful way to decorate for your party really bringing the underwater to your home. This is so easy to make take a dollar store paper lantern and add colorful streamers underneath to create the long tails.

  1. DIY Net Wrapped Mason Jars

DIY under the sea mermaid party idea. DIY mason jar wrapped net. Who doesn't love mermaids?! This is genius! So perfect for kids birthday parties! Under the sea and the little mermaid as a party is awesome! So many DIY ideas that are easy and cheap. Which is even better since we done want to break our budgets throwing a mermaid party. I like the food, dessert, decorating, activity ideas! Love it saving it for later!

Found from Beau Coup

I love this DIY wrapped project! It’s amazing using mason jars wrapped in netting so you really get that under the sea vibe.

  1. Tissue Paper Number

DIY under the sea mermaid birthday party ideas. Tissue paper number. Who doesn't love mermaids?! This is genius! So perfect for kids birthday parties! Under the sea and the little mermaid as a party is awesome! So many DIY ideas that are easy and cheap. Which is even better since we done want to break our budgets throwing a mermaid party. I like the food, dessert, decorating, activity ideas! Love it saving it for later!

Found from Hative

This is perfect for the front door of the party or a fun photo booth and it’s made with tissue paper that you can find at the dollar store for nothing! Use cardboard as the backing so it’s really light weight and easy to make.

  1. Utensil Candelabra Centerpiece

Who doesn't love mermaids?! This is genius! So perfect for kids birthday parties! Under the sea and the little mermaid as a party is awesome! So many DIY ideas that are easy and cheap. Which is even better since we done want to break our budgets throwing a mermaid party. I like the food, dessert, decorating, activity ideas! Love it saving it for later!

Found from Kara’s Party Ideas

This is more specific for a Little Mermaid theme but I just think that this is amazing and such a fun centerpiece.

  1. No Churn Mermaid Ice Cream

Mermaid no churn ice cream. Who doesn't love mermaids?! This is genius! So perfect for kids birthday parties! Under the sea and the little mermaid as a party is awesome! So many DIY ideas that are easy and cheap. Which is even better since we done want to break our budgets throwing a mermaid party. I like the food, dessert, decorating, activity ideas! Love it saving it for later!

Found from Homemade Interest

Omg! This ice cream is beautiful and it’s so easy that you don’t need an ice cream machine to make it! The colors are bright and taste great!

  1. Mermaid Sign

Who doesn't love mermaids?! This is genius! So perfect for kids birthday parties! Under the sea and the little mermaid as a party is awesome! So many DIY ideas that are easy and cheap. Which is even better since we done want to break our budgets throwing a mermaid party. I like the food, dessert, decorating, activity ideas! Love it saving it for later!

Found from Elevate Everyday

Make your own mermaid sign! It’s clever and so easy to make yourself. This is a simple step by step tutorial!

  1. Mermaid Theme Snacks

Who doesn't love mermaids?! This is genius! So perfect for kids birthday parties! Under the sea and the little mermaid as a party is awesome! So many DIY ideas that are easy and cheap. Which is even better since we done want to break our budgets throwing a mermaid party. I like the food, dessert, decorating, activity ideas! Love it saving it for later!

Found from Brie Brie Blooms

This just proves you can enjoy a mermaid party at any age. Here are some clever ways to display snacks and food for your amazing party!

  1. DIY Mermaid Tiara

Who doesn't love mermaids?! This is genius! So perfect for kids birthday parties! Under the sea and the little mermaid as a party is awesome! So many DIY ideas that are easy and cheap. Which is even better since we done want to break our budgets throwing a mermaid party. I like the food, dessert, decorating, activity ideas! Love it saving it for later!

Found from Creative Green Living

Every mermaid needs a crown and making your own shell tiara is so perfect! Take a cheap dollar store tiara and add jewels and sea shells to complete the look!

12. Under the Sea Friends

Under the sea balloon friends. Little mermaid party ideas. Who doesn't love mermaids?! This is genius! So perfect for kids birthday parties! Under the sea and the little mermaid as a party is awesome! So many DIY ideas that are easy and cheap. Which is even better since we done want to break our budgets throwing a mermaid party. I like the food, dessert, decorating, activity ideas! Love it saving it for later!

Found from Rindy Mae

Every mermaid has their own sea creature friends. Have a hanging octopus made from balloons and streamers for under the sea friends.

  1. Mermaid Chocolate Bark

Mermaid chocolate bark. Who doesn't love mermaids?! This is genius! So perfect for kids birthday parties! Under the sea and the little mermaid as a party is awesome! So many DIY ideas that are easy and cheap. Which is even better since we done want to break our budgets throwing a mermaid party. I like the food, dessert, decorating, activity ideas! Love it saving it for later!

Found from Bread Booze Bacon

Simple desserts like chocolate bark are so easy. Using a mix of bright color chocolates, edible glitter and edible pearls makes a huge impact on a dessert table! It’s so pretty and who doesn’t love chocolate!

  1. Starfish Table Setting

Table setting for DIY mermaid party ideas. Who doesn't love mermaids?! This is genius! So perfect for kids birthday parties! Under the sea and the little mermaid as a party is awesome! So many DIY ideas that are easy and cheap. Which is even better since we done want to break our budgets throwing a mermaid party. I like the food, dessert, decorating, activity ideas! Love it saving it for later!

Found from Hot Ref

This is a simple way to transform your table. I love this idea if you plan on having a sit down birthday meal. Use dollar store table runners, shells, starfish, and netting in no time you have a true under the sea tablescape.

  1. Make Your Own Mermaid Slime

Who doesn't love mermaids?! This is genius! So perfect for kids birthday parties! Under the sea and the little mermaid as a party is awesome! So many DIY ideas that are easy and cheap. Which is even better since we done want to break our budgets throwing a mermaid party. I like the food, dessert, decorating, activity ideas! Love it saving it for later!

Found from the Farm Girl Gabs

This is an awesome activity to do during the party! Making your own slime is huge right now and its so fun to play with! This slime recipe is safe for kids to make!

  1. $5 DIY Photo Booth Backdrop

$5 Dollar store photo booth backdrop. Who doesn't love mermaids?! This is genius! So perfect for kids birthday parties! Under the sea and the little mermaid as a party is awesome! So many DIY ideas that are easy and cheap. Which is even better since we done want to break our budgets throwing a mermaid party. I like the food, dessert, decorating, activity ideas! Love it saving it for later!

Found from Rain on a Tin Roof

Photo booths are so in right now for parties. They are so fun and you can get so creative with the props for the photos. Make your own backdrop out of dollar store tablecloths, use sharp scissors and thumbtacks or push pins. That’s it!

  1. Sand Dollar Snickerdoodle Cookies

Sand dollar snickerdoodle cookies for mermaid under the sea party. Who doesn't love mermaids?! This is genius! So perfect for kids birthday parties! Under the sea and the little mermaid as a party is awesome! So many DIY ideas that are easy and cheap. Which is even better since we done want to break our budgets throwing a mermaid party. I like the food, dessert, decorating, activity ideas! Love it saving it for later!

Found from Lil Luna

I love this cookie! This is a tasty recipe that you can add sliced almonds to the top of the cookies before baking. It really looks like a sand dollar!

  1. Mermaid Favor Bags

Mermaid birthday favor bags. Who doesn't love mermaids?! This is genius! So perfect for kids birthday parties! Under the sea and the little mermaid as a party is awesome! So many DIY ideas that are easy and cheap. Which is even better since we done want to break our budgets throwing a mermaid party. I like the food, dessert, decorating, activity ideas! Love it saving it for later!

Found from ETSY

This is a DIY printable to make your own party favor/goody bags. Simply cut and glue them onto favor bags and you can print as many as you need!

  1. Mermaid Treasure Chest for Cards

Mermaid treasure chest. DIY birthday party ideas. Mermaid under the sea. Who doesn't love mermaids?! This is genius! So perfect for kids birthday parties! Under the sea and the little mermaid as a party is awesome! So many DIY ideas that are easy and cheap. Which is even better since we done want to break our budgets throwing a mermaid party. I like the food, dessert, decorating, activity ideas! Love it saving it for later!

Found from That’s So Lovely

I love this! It’s a wonderful way to let your guests place their gifts in. This is a brilliant idea that you can easily make at home! All items can be found at the craft store!

  1. Gold Starfish Wands

Who doesn't love mermaids?! This is genius! So perfect for kids birthday parties! Under the sea and the little mermaid as a party is awesome! So many DIY ideas that are easy and cheap. Which is even better since we done want to break our budgets throwing a mermaid party. I like the food, dessert, decorating, activity ideas! Love it saving it for later!

Found from Sea Lane Studio

I think my favorite mermaid party idea might just be these starfish mermaid wands. If you’re not planning for your party to be in teal, purple and gold, she can customize your ribbon in any color.

  1. “Sea Water” Blue Raspberry Lemonade

DIY mermaid under the sea birthday party ideas. Blue raspberry lemonade. Who doesn't love mermaids?! This is genius! So perfect for kids birthday parties! Under the sea and the little mermaid as a party is awesome! So many DIY ideas that are easy and cheap. Which is even better since we done want to break our budgets throwing a mermaid party. I like the food, dessert, decorating, activity ideas! Love it saving it for later!

Found from Pluckys Second Thought

Blue raspberry lemonade served in glass bottles and embellished with a gold straw and starfish looks straight from the sea! I love the mini glass bottles and gold straws!

  1. Mermaid Sequins Birthday Cake

Who doesn't love mermaids?! This is genius! So perfect for kids birthday parties! Under the sea and the little mermaid as a party is awesome! So many DIY ideas that are easy and cheap. Which is even better since we done want to break our budgets throwing a mermaid party. I like the food, dessert, decorating, activity ideas! Love it saving it for later!

Found from Lenka Kutsu

I love love love this cake! It is so beautiful and totally bringing the mermaid and under the sea vibe to the birthday party. Learn how to make the best foolproof cake here. https://xokatierosario.com/best-foolproof-vanilla-cake/

  1. Easy Mermaid Make-Up

 

Found from Kids Cooking and Crafts

I love this make up tutorial it’s so easy that this process is for kids! Such beautiful makeup!

  1. Message in a Bottle Party Favors

Message in a bottle. Mermaid DIY birthday under the sea party ideas. Who doesn't love mermaids?! This is genius! So perfect for kids birthday parties! Under the sea and the little mermaid as a party is awesome! So many DIY ideas that are easy and cheap. Which is even better since we done want to break our budgets throwing a mermaid party. I like the food, dessert, decorating, activity ideas! Love it saving it for later!

Found from Living Well Spending Less

This is a wonderful party favor. You can easily customize the messages for each guest. It’s a fun way to share thoughts with loved ones at your party! And of course it fits with the mermaid theme!

  1. Mermaid Cupcakes

Who doesn't love mermaids?! This is genius! So perfect for kids birthday parties! Under the sea and the little mermaid as a party is awesome! So many DIY ideas that are easy and cheap. Which is even better since we done want to break our budgets throwing a mermaid party. I like the food, dessert, decorating, activity ideas! Love it saving it for later!

Found from Seatail Shop

No birthday party is complete without sweet treats. I love these mermaid tail cupcakes! By stripping the pipping bag with different color frostings it’s so easy to make a tie dye effect with buttercream!

  1. Paint Your Own Treasure Chest

DIY mermaid under the sea. DIY treasure chest paintings. Who doesn't love mermaids?! This is genius! So perfect for kids birthday parties! Under the sea and the little mermaid as a party is awesome! So many DIY ideas that are easy and cheap. Which is even better since we done want to break our budgets throwing a mermaid party. I like the food, dessert, decorating, activity ideas! Love it saving it for later!

Found from Catch My Party

Here is another fun activity for the party! Paint your own treasure chest and have the kids create their own. What’s better is that this can also be their party favors.

You May Also Enjoy:

I hope you’re inspired to craft, bake, create and celebrate with a mermaid birthday party!

Happy Crafting!

Hey, if you like entertaining and want to decorate cakes at home, you really should check out, Cake Decorating Creator Program, my online cake program. I coach you on everything I teach on these cake tutorials so that you can uplevel your baking and decorating skills. We 10x it so you get the results you want most. Like any new skill, it’s important to learn from the ground up to build a foundation, so you can take on any cake challenge. It is an investment your future self will thank you for. Check it out at XOKatieRosario.com/creator-program. I will see you there!

Pin it! Save it for later!

Who doesn't love mermaids?! This is genius! So perfect for kids birthday parties! Under the sea and the little mermaid as a party is awesome! So many DIY ideas that are easy and cheap. Which is even better since we done want to break our budgets throwing a mermaid party. I like the food, dessert, decorating, activity ideas! Love it saving it for later!

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About Katie

I’m Katie, a creative girl with a major sweet tooth. I’m a passionate pastry chef and food stylist from Los Angeles, CA. Usually, you can find me in my happy place: the kitchen. If I’m not there, I’m probably coordinating a wedding, wine tasting or dreaming up my next trip.

I started my journey as a food blogger to share my love of food and cake decorating! I knew very early on that I have always wanted to make people happy through all things creative. My goal is to help you create memories through cakes and delicious recipes.

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