Turn Your Cupcakes Into A School Of Fish
There are so many great under the sea party ideas that really get in touch with your creative side. The theme leaves so much room to play around and turn just about everything into a fun little detail. Look how cute these little fishy cupcakes from Two Sisters are! They leave room for custom cupcake toppers if youre looking to include those as well.
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!
Make A Splash With These Under The Sea Birthday Party Ideas
Someone special has their heart set on an under the sea birthday party, and its time to get planning. This is such a fun theme to work with, as there are so many incredible styling, activity, food, and invite options.
Lets take a look at some of our favorite under the sea birthday party ideas ranging from decor and games to delicious snacks and fun favors. Plus, well share some of our most loved under the sea-themed party invites so your guests are excited to make some waves!
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Blue And Green Birthday Balloon Arch
Get a balloon pump ready, or call in the professionals to put together a stunning balloon arch for your underwater-themed party. Style your blue, teal, green, and aqua balloons into an archway to greet guests, with a birthday banner hung across the top. You can also cut the cake beneath this ocean-themed arch to make the most of your under the sea party decor.
Diy Coral Reef Sculptures

For a more decadent feel, we love this pool noodle craft! You can usually find pool noodles for $1 or $2 apiece, so it wont break the bank. Grab a box cutter and some wire hangers and get to work! This isnt a kid-friendly craft, so you might want to do this during nap time.
Need more coral inspiration? Weve got it! Just grab a can of spray insulation and start creating. Spray it onto an old cardboard box into your desired shapes. Paint the finished product in your theme colors and youre done!
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Unique Under The Sea Party Ideas
- Date: November 24, 2022
Are you planning a party for a little one who cant get enough of mermaids, sand castles, and sea creatures? Youll want to see these 12 unique under the sea party ideas that are sure to make a splash! While youre searching through this deep-sea treasure trove of tips, look out for some of the relevant Peerspace listings weve included. Put on your snorkel and lets dive right in!
Under The Sea Treasure Hunt
Treasure hunts are perfect forpirate birthday parties, but theyre great for under the sea parties, too. Instead of hunting for treasure on land, send your guests on an adventure through the depths of the ocean as they look for clues that will lead them to an undersea treasure. Depending on the age group of your guests, you can include riddles, puzzles, or physical challenges in this DIY quest for treasure. Be sure to have treats, trinkets, and toys in the treasure chest, as theyll make for memorable party favors.
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Under The Sea Party For Girls And Boys
Pool party themes help give direction to your invitations, decorations, food, games and party bags. The decorations and games can be adjusted so that they appeal to all different ages.
My granddaughters loved helping me make these fish partydecorations made out of paper plates. We painted them blue, cut out themouths, stapled two plates together, and then stapled in deep blue andaqua blue tissue paper that were cut into strips.
Place the fish in lots of different places. We hung these”tropical fish” from the patio umbrella that is also decorated with aquablue shimmery netting.
Our painted tropical fish were put on blue painteddowels and set on either side of the pool gate welcoming the pool partyguests as well.
Under The Sea Party Favor Buckets
Thank your party guests for swimming by with these under the sea party favor buckets. You can fill them with anything sea or ocean-inspiredswim towel and goggles or fish-themed toys and treats.
Put together adorable Splish splash party tubes using basic candy tubes. You can embellish them with under-the-sea-inspired embellishments like cutouts, stickers, and ribbons and fill them with gummy fish.
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Under The Sea Fringe Activities
Choose one of the following:
While waiting for all your guests to arrive at your roaring good party, have some fringe activities to keep the children occupied:
- Marine Creature Balloon Sculpting Octopus, seahorse, turtle, fish, anything is possible!
- Kid in Bubble Station
- Under the sea customised Caricature
Under The Sea Party Ideas For Decorations
Under the Sea party decorations bring color, fun and sparkle to your swimming pool party.
1. The Pool Gate
Small and large inflatable fish made for perfect Under the Sea party decorations in and out of the pool.
Start with an inflatable fish ring tied to your pool gate to greet your guests.
I set the bubble machine on the edge of the pool so the bubbles floated over the water.
3. Sidewalk or Path to the Pool
Scatter sea shells on the sidewalk leading to the pool.
Or you can also scatter foam sea shells or under the sea foam stickers.
Our little ones loved gathering their foam under the sea creatures as they walked to the pool.
Extra stickers make great party favors.
4. Tropical Fish Craft
My granddaughters helped by painting the paper plates blue usinglittle sponges. Blue rhinestone stickers make the eyes sparkle.
Strips of different color blue tissue paper and some left over shimmering Easter grass were stapled on as the tail.
Punch a hole on the top and use aqua blue ribbon to tie the fishto the pool gate, the arbor or on the ribs of your pool umbrella.
These can be done ahead of time or set up as one of the Under the Sea crafts for the party guests.
5. The Party Table
Shimmering aqua blue netting was purchased at Hobby Lobby.
The netting was draped up and around the umbrella ribs and thenwrapped around the umbrella pole. The extra netting was pooled onto thetable.
6. The Swimming Pool
I found this 24″ beach ball at Target.
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Under The Sea Decorations
Create under the sea atmosphere with our balloon decorations. What you get:
- 1.9 x 1.4m under the sea banner
- Helium balloons Choose different colours for the helium balloons depending on what you want to show:
- transparent balloons to depict bubbles in an ocean.
- blue and white balloons to show colours of the waters.
Of The Best Easy Under The Sea Theme Party Ideas

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Create an awesome under the sea theme party with these easy DIY ideas. Kids will love all the party food, decorations and activities. All these ideas are easy to recreate and will ensure that you will have an under the sea party to remember.
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An under the sea theme party can mean SO many things. It could be a beach party, it could be a mermaid party, or it could be a sea animals party. It doesnt matter what your child likes, it is easy to use the under the sea theme elements for many other parties too.
Think fish, crabs, starfish, seashells, fish nets, blue sea and sand. Sand castles, boats and fishing. The options are endless.
You will find that these under the sea theme party ideas can easily be incorporated into the specific beach or sea themed party you are having. Use the ideas, but then change up the colors to suit the particular style of party you are having.
This is such a fun theme to prepare and decorate for.
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Get Creative With Shark Gummies And Swedish Fish
Everyones favorite oceanic candies have to be Swedish Fish and shark gummies! Use that to turn them into some unique under the sea party ideas. We love these ocean blue lemonade popsicles from Play Party Plan. Theyre sure to be a refreshing treat on a hot summer day and as an added bonus, also have those tasty little gummies in the middle.
Fun Under The Sea Birthday Party Invites
Design: Lisa McLean Design
All these under the sea party ideas need an invite that feels just as impressive. Get your guests ready to dive in by sending them one of these under the sea theme party invitations.
With Greenvelope, its easy to turn any template into a gorgeous personalized birthday party invite. Start with a digital invitation design you love, choose your colors, and then customize the layout, fonts, and wording until your perfect invitation is complete. Here are a few fin-tastic under the sea themed party invitations to inspire you.
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Hidden Treasures Ocean Coloring Page
Source: Arts & Crackers
For a quiet activity, how about leaving some coloring pages for the kids to enjoy. There are also 6 hidden treasures in the reef to be found.
With so many under the sea theme party ideas to choose from, you certainly wont struggle to put an amazing party together. The fact that all these ideas are super easy to replicate means that you can be confident you can create a stunning party even if it means you dont have any craft or baking skills.
Let the kids help prepare the party with you for some added excitement and fun.Lets keep in touch. Did you love these under the sea theme party ideas? Sign up to the weekly newsletter to be kept updated with other easy party, recipe, decoration ideas and more.
Mermaid Under The Sea Party
Because we were having an outdoor pool party for Charlottes 3rd Birthday, I encouraged her to choose a Mermaid Themed Party / Under the Sea Themed Party. She loved the idea!
I made her a shirt to wear on her actual birthday, which was a week before the party. Her shirt says This little mermaid is 3. I found some pretty holographic heat transfer vinyl at a local vinyl store and also a mermaid patterned vinyl that I used for the 3. I cut the vinyl using my Silhouette machine.
On her actual birthday, we took her out to lunch and to Build A Bear for their pay your age Bear. Because we got a good deal on the bear, we let her choose an outfit. You can see how nicely the bear matches her!
I also made my two older girls t-shirts to wear that day that say Mermaid squad. I designed them so the A in Mermaid is a starfish and the end of the d in squad has a mermaid tail. I used the same holographic vinyl as for Charlottes shirt.
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Have Your Snacks With Themed Dishes And Cutlery
Did you know that its super easy these days to find complete sets of themed cutlery for your parties? No more going to the party store and having to find everything separately. Now, you can go to Amazon and find things like this huge 171 piece under the sea party decorations tableware set!
Love all things sea and sand? Then you need to see our tropical theme party ideas next!
Jelly Fish Hanging Lanterns
Did you know you can transform hanging party lanterns into awesome hanging jellyfish? You wont believe how easy it is to use a combination of curling ribbon, iridescent ribbon, streamers, and strips of plastic tablecloths to recreate this look. A little pinching and pulling of the strips of plastic tablecloth result in a ruffled tentacle look.
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Invite Guests To Your Underwater Kingdom With Themed Invitations
Getting everyone on board with your theme before the party is always the right move. Whether youre sending invites digitally or through the mail, make sure they are clear about what the theme is. We recommend something like these editable under the sea birthday invites from Sugar Puff Kids on Etsy. Theyre easily customized to your little mermaids name and clue your guests in on the type of party youre having.
Mimic Swimming Creatures With Paper Lanterns

A clever way to have some underwater visitors to your party that arent balloons is by using paper lanterns. These mermaid party jellyfish lanterns from Party Treasure Co. on Etsy can give you an idea of what we mean. Stringing a few of these up will make it look like swimming jellyfish are passing through your party! Or, if youre feeling crafty and want to make your own, this tutorial for adorable fish paper lanterns is a great alternative and a fun little project.
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Under The Sea Shell Centerpieces
FROM: A Princess and Her Pirates
These glasses with mermaid shells on them become perfect centerpieces to a Mermaid Birthday Party or Under The Sea Party. I hadnt really thought about centerpieces but when I saw these I was like, what a great idea.
Carrie has done a great job on these centerpiece using here Silhouette Design Software to create the gorgeous purple sparkly shells, who says the kids have o have all the fun. Checkout the tutorial to make these
Under The Sea Party Favors
Download the vintage Under the Sea Party Favor Labels
The party was a huge success for our family and I know it will be for yours too! Cherish these times before they grow up and are too cool for mermaids!
If you love this party idea, you will love all the ones I am pinning right now. Follow me on for party ideas, games, and decor ideas. Grab ourfree birthday party planner to keep organized for your next party!
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Under The Sea Themed Party
Whether it is a marine themed party, mermaid themed party, under the sea themed party, shark themed party, Mr Bottles Kids Party got it covered! All the items in the package are customisable to your specific theme. For instance, if your children like baby shark, you can choose shark related designs and more.
Sail through with a breeze with our package which includes decorations, entertainment, fringe activities and more! You can also put the items a la carte if you want to customise your own package.
Shark Attack Snack Mix
Attaching a printable shark attack snack mix label to a clear snack bag makes snack time more exciting. Fill the bag with an assortment of gummy sharks and fish.
Colored rice and laminated sea life printables make this under the sea search and find game come to life. This is a fun twist to a traditional I Spy game.
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Under The Sea Party Ideas
Summer is just around the corner and just in time for an Under the Sea party! If youre looking for a fun party idea that can be done indoors or outdoors, than this party is for you! So, lets get started!
Disclosure: As a member of the Oriental Trading Fun Squad, I receivedcompensation and/or products in exchange for my styling and crafting services. As always, all opinions are my own. #orientaltrading #otcfunsquad
Bubba The Bottom Feeder
Bubba The Bottom Feederhas been “eating” lots of fish on the bottom of our pool. If you arelooking for diving games for your Under the Sea party this is a fun one.Each guest takes a turn “feeding” Bubba who is sitting on the bottom ofthe pool. See how many fish it takes to make him rise to the top.
Just let the kids each take a turn and have fun with it – with no real winners or losers.
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Under The Sea Snow Globe Aquariums
Need a quick and frugal under-the-sea party craft and favor idea? These DIY under-the-sea snow globe aquariums upcycle baby food jars and use a few easy-to-find materialsglitter, spray paint, glycerin, food coloring, and small toy sea animals.
Who knew that an ordinary watermelon could be carved into a ferocious under-the-sea party predator? This tutorial for carving your own shark watermelon fruit bowl will walk you through all of the steps.
Diy Fish Net Balloon Decoration

In designing the food table, the main focus was this fish net party decoration to hold balloons over the food table. It was a very windy day, which was quite frustrating when trying to assemble this focal point. Balloons kept blowing away and the lettering for Charlotte is 3 kept blowing in all directions. It took more time than I had budgeted to get this assembled, but I have a few tips, as well as a suggestion I wish I had known about at the time.
I wanted pearlized balloons rather than typical matte ones to add some shine. In fitting with the color scheme, I chose white, purple, and seafoam colored balloons. We blew them up all around the same size. Ive seen some where you blow some up large, some medium, and some small, which is also very cute.
To hang the fish net, I used clear fishing line to suspend the net from some nails under our deck. You could try using outdoor command hooks if you dont already have an easy place to tie to the fishing net. I tied it up on each end and in the middle. Then, I folded the net up half way and started securing the sides together with clear fishing line. The spacing is important because you dont want a balloon to be able to fit through and blow away.
Balloon Garland
Lettering
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