Fin-tastic Ideas for an amazing under the sea birthday party!

Dive into the fun with some Under the Sea Party ideas.  What better way to celebrate a birthday than an adorable under the sea bash.  There are so many amazingly fun things you can do with an ocean theme…especially if you are going to be swimming at your party.  

This is such a wonderful theme for summer and can be delightful for either boys or girls.

Looking for more ocean party ideas, dolphin party ideas, mermaid party ideas and under the sea party ideas? Also check out this mermaid party!

My little girls LOVE the Little Mermaid.  Seriously, LOVE!  We watch it a lot.  I always get those uber catchy tunes stuck in my head.  “The seaweed is always Greener…in somebody else’s lake…Under the Sea…”.  Good times.


☑️ This Under the Sea Party Kit is the perfect set to get your party planning headed in the right direction!


As I sit here singing away to no one in particular, it makes me want to share some fun Under the Sea party idea.  What better than transforming your party into an Ocean Wonderland….maybe you will even luck out with some musical fishy pals!

Under the Sea Party Food Ideas

Of course if you are going to throw an under the sea party…you must have some delicious and super creative desserts and party food to serve.  Here are some of the most adorable under the sea ideas for your party…

Sea Turtle Cupcakes from Family

These cute little DIY sea turtles are too much!  Absolutely adorable.  I love how detailed they are with such easy to use, inexpensive candy tools.  Buy some grocery store cupcakes (or bake your own) and add some red and green gumdrops, green spearmint leaves candy, and peach ring candies.


Cupcake Fish from Susanne Ashby Photography

This fish cupcake cake is absolutely adorable.  I love the idea of a cupcake cake because it is so easy to serve.  Why bother with the knife, when your guests can grab a cupcake and go?


Octopus Cake Pops from That Cute Little Cake

Aren’t these little Octopuses (Octopi??) super cute. These cake pops would be such a great addition to any under the sea party.

Octopus Cupcakes from The First Year

How precious are these octopus cupcakes?  They are so fun and super simple.  I think those are the best kind of party treats!!

Baby Shark Birthday Cake from Kara’s Party Ideas

If you love the baby shark craze, you will love this fun baby shark cake! What a fun and super trendy way to make your under the sea party stand out!

Fondant Crabs from Kara’s Party Ideas

Hello adorable!  These fun and friendly little crabs are perfection for an ocean themed party!

Caramel Crabs from Hungry Happenings

Ok, can we just take a minute to appreciate the absolute adorableness of these Rice Krispies crabs.  I mean, come on….so stinking cute, right?

Sand Dollar Cookies from Kara’s Party Ideas

Here is a super simple under the sea treat idea that would be perfect for a beach or ocean themed party.  They are easy and delicious.

Fish Sugar Cookies from Mimi’s Dollhouse

Here is a super simple fish cookie idea that is perfect for a fish themed party of an under the sea birthday.  

Fishing Party: DIY Fish Cookies.  Bust out the tackle boxes and wet your line, these fish sugar cookies are sure to get you telling fish stories. #parties #diy #baking #fishingparty #birthdays #kidbirthdays

Fish Cupcakes from Two Sister’s Crafting

These fishy cupcakes are so cute and super easy to make.  I love that the colors are so easy to customize and you can easily make fish with a tropical feel with little prep!

Seaweed Straws from Catch My Party

Sometimes a clever treat doesn’t even have to be baked.  Grab some sour straws and you have instant seaweed!

Fish Marshmallows from Kara’s Party Ideas

These are super adorable and easy to make.  Simply place a paper straw into a marshmallow and dip in blue chocolate…add your goldfish and brush with brown sugar before it cools. Bingo!!

Under the Sea Graham Crackers from The First Year

This clever and absolutely adorable under the sea treat is so fun and perfect for a little one’s under the sea party.

Under the Sea Party Supplies

If you are throwing an under the sea party, a great way to set your party off right is by getting some adorable under the sea decorations and tableware.  I am in LOVE with this design from Meri Meri.  The metallic sharks are fantastic and those cute little fish napkins!!! Adorbs!

This set from Oriental Trading is also super adorable for an under the sea themed party.  The fish shaped plates are soooo adorable!

DIY Under the Sea Decorations

OF course, along with that fun under the sea tableware…you should also add in some fun Under the Sea Crafts and DIY decorations.  Here are some of the best:

Jelly Fish Hangers from Party City

Ok…seriously…these are AH-MAY-ZING.  So simple and yet so clever.  They are perfect for an under the sea party and the bright colors are fantastic.  The best part of these DIY jellyfish, they are crazy easy to make and super inexpensive.  You just need some multi-colored paper lanterns and a rainbow plastic tablecloth.  So simple, yet soooo perfect!  We made these for my daughter’s mermaid party…and they were fabulous.

Felt Under the Sea Garland from Poly Chrome Crafts

These felt decorations are stinking cute.  Together they make the most adorable banner.  They can also be used separately for things like cake toppers and under the sea party favors.

Crab Pom from The Shower Planner

These are cute and fun little crabby sea creatures…I love the idea of using easy party decor and giving it a little twist.  just a simple red tissue pom and some red cardstock.  I just love simple and adorable ideas, don’t you!



Fish Paper Lanterns from Make Life Lovely

Here is another cute and easy way to use those colorful paper lanterns.  These would be adorable “swimming” around the room or yard for a pool party.

Under the Sea Table skirt from Della Carta

This gorgeous table skirt would definitely be a stunning way to accent your under the sea party table!

Oh. So. Cute.  If you liked these ideas, please pin this image to your birthday party Pinterest board:


We also have printable under the sea decorations and printable mermaid decorations available for purchase in the shop, so why don’t you throw your own party!!



Conclusion for Unforgettable Under the Sea Themed Party Ideas:

These ideas will help you to throw the Under the Sea party of your dreams.  Their are so many amazing under the sea desserts and party decorations you can choose from to diy the most adorable birthday party.


Related posts for Amazing Under the Sea Parties:

Thank you for reading all our favorite Under the Sea Party Ideas!