30+ Must-Have Mermaid and Pirate Party Ideas for Kids! 🧜♀️🏴☠️
Create unforgettable memories with a mermaid and pirate-themed party! Explore fun decorations, games, and tips to host a magical celebration for family and friends. 🏴☠️🧜♀️
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Looking to throw a birthday bash that’s equal parts magical and swashbuckling? A mermaid and pirate party is the perfect way to bring the best of under-the-sea adventures and high-seas excitement together! Mermaid and pirate parties are popular choices for kids’ celebrations.
Whether you’re celebrating for your daughter and her friends, planning for twins, or just want a unique birthday party theme, this idea is a hit with both girls and boys. We’ve got you covered with decorations, games, and party supplies that will make your event unforgettable.
Welcome to the Ultimate Mermaid and Pirate Party!

Ready to dive into a world where mermaids and pirates rule the waves? Planning a mermaid and pirate party is your ticket to a sea birthday party that’s bursting with adventure and fun! With a pirate party theme, you can transform any space into a magical ocean playground, complete with shimmering mermaid tails, hidden treasure, and swashbuckling excitement. Whether you’re dreaming of a mermaid party for your little one or a pirate birthday party for your crew, the right party decorations and party supplies will set the stage for an unforgettable celebration.
From sparkling under-the-sea details to bold pirate touches, this theme is perfect for kids who love a little bit of magic and a lot of action. Imagine a room filled with glittering tails, seashells, and pirate flags—every detail designed to make your birthday party the talk of the seven seas. So grab your decorations, gather your crew, and get ready to set sail on the ultimate mermaid and pirate adventure!
Plan Your Crew: Invitations and Guest List

Every great pirate party starts with a crew! Set the tone for your celebration by sending out invitations that capture the magic of your pirate party theme. Get creative with designs—think treasure maps leading to the party, or invitations shaped like a mermaid tail. Add playful touches like cute sea creatures (seahorses, starfish, or smiling fish) to make your invites extra special.
Be sure to include all the important details: the date, time, location, and a note encouraging guests to dress as their favorite pirate or mermaid. This not only adds to the fun, but also helps everyone get into the spirit of your mermaid and pirate adventure. Don’t forget to ask parents to RSVP and mention any special requests, like bringing a favorite sea-themed accessory or noting dietary needs.
With a thoughtfully planned guest list and whimsical invitations, your party will be off to a fantastic start—everyone will be counting down the days until they can join your crew and hunt for treasure under the sea!
Chart Your Course: Budgeting and Timeline Tips

A smooth-sailing mermaid and pirate party starts with a solid plan! Begin by setting your budget for party supplies, decorations, and activities. Break it down into categories—food, games, and DIY projects—so you can prioritize what matters most. For a true pirate party, consider crafting your own treasure chest or even a cardboard ship to keep costs down while adding a personal touch.
Next, map out your party timeline. Schedule time for setup, guest arrivals, and all the exciting activities—like a thrilling treasure hunt with a clever first clue to get the kids started. Make sure to include classic favorites like face painting and have plenty of shark bait (think gold-wrapped chocolates or colorful candy) ready to keep your little pirates and mermaids energized.
With a clear budget and a well-planned timeline, you’ll be able to focus on the fun—from the first splash to the last piece of treasure found. Your diy touches, sparkling gold coins, and creative clues will make this a party your kids will remember for life!
Last year’s party was such a success that it inspired us to bring even more creative touches to this year’s mermaid and pirate party, showing just how timeless and popular these themes remain. Here are the must-have ideas to make your mermaids birthday party and pirate birthday party a true treasure trove of fun!
Transform your house into an underwater paradise that merges the worlds of mermaids and pirates. Mix shimmering blues and greens with hints of black, red, and gold for a balanced look.
- Backdrops and Balloons: Use glittery blue and teal fabrics or ocean-themed printables as a backdrop. The space can be decorated with ocean-inspired elements like waves, shells, and pirate flags. Try ocean-themed backdrops or sea-inspired balloons featuring seashells, cute sea creatures, and pirate skulls. You can also print ocean-themed backdrops or cutouts for easy DIY decor.
- Treasure Chest Centerpieces: Fill them with gold coins, faux pearls, and sparkly gems. Check out mini treasure chests and pirate coins. Sprinkle candy around for a sweet touch, like chocolate coins!
- DIY Additions: Paint shells, hang fishnets, and use strings of plastic bubbles to give the room a true ocean feel. I created some of the decorations myself, like hand-painted shells and custom props. Look for DIY seashell kits, fishing nets, and plastic bubbles.
- Themed Tablescape: Lay out a fishnet table runner on your table, then add mini treasures like starfish and gem-shaped stickers (gem stickers here). Dual-themed plates mermaid and pirate plates will delight all the kids.
Add a themed sign, such as a "Welcome to Mermaid Cove" or "Pirate’s Lair" sign, to enhance the party atmosphere.
Your decorations will set the mood and have everyone feeling like they’re under the sea, ready for adventure!
Costumes are the ultimate way to get your friends and family into the spirit of your party. Encourage everyone to dress for the theme and even provide fun accessories. To boost participation, I asked friends to come dressed as their favorite mermaid or pirate.
- For Mermaids: Sequined tops, flowy skirts, or full mermaid tail costumes. Add tiaras, glittery face art, and pearl necklaces for an extra magical touch.
- For Pirates: Striped shirts, bandanas, and painted pirate mustaches for instant swashbuckling. Don’t forget toy swords and hooks!
- Costume Extras: I decided to create a “Dress-Up Cove” with extra hats, sashes, necklaces, and pirate rings for anyone who forgot a costume, so everyone could join in the fun.
Face painting is also a great activity to kick off the party. Add mermaid scales, shark teeth, or pirate scars that kids and adults will love!
A spectacular spread elevates any birthday party, and this theme offers so many creative food ideas. Here’s how to mix salty and sweet treats for your little adventurers:
- Mermaid Delights:
- “Shark Bait” gummy cups with candy sharks swimming in blue Jello.
- Shell-shaped sandwiches stuffed with kid-friendly fillings.
- Mystical cupcakes topped with edible candy pearls and shimmering dust. Cupcakes can be a fun and affordable alternative to traditional cakes for themed parties, and they can be easily customized to match the party theme. We added candles to both the cupcakes and the cake to enhance the festive atmosphere.
- Pirate Grub:
- Cannonball meatballs that are fun to grab and eat.
- Treasure maps printed on sugar cookies.
- A two-sided cake featuring mermaid scales on one side and a pirate map on the other!
As a bonus, we included chocolate gold coins hidden in treasure chests, which delighted the kids.
Set up separate “Mermaid Cove” and “Pirate’s Galley” food tables for a decorative way to split the themes while serving all tastes.
Every great mermaid and pirate party needs activities to keep the kids moving and laughing. These games will make waves of fun:
- Treasure Hunt: Before starting, have the kids sitting together while you explain the rules and hand out the first clue. Hide wrapped goodies like candy, faux pearls, and treasure chest trinkets around the yard or house. Write a series of clues that both mermaids and pirates can solve to find the loot. The first clue should be easy, but make the middle clues more challenging for older children.
- Walk the Plank: Set up a beam or tape line as the plank. Add a blue tarp (“shark-infested waters”) beneath for adventurous crossing!
- Mermaid Tail Race: Have the kids hop around in mermaid-tail blankets or sacks to race to the finish line. Get ready for giggles!
These activities will keep everyone entertained, from energetic toddlers to curious older kids.
Mermaids and pirates love treasure, so set up a corner for guests to create their own!
- DIY Necklace Station: Provide beads, painted seashells, and little charms to create customized keepsakes.
- Treasure Maps: Give each child a blank map to decorate with crayons, markers, and pirate-themed stickers.
These activities give the kids something fun to do while also producing adorable bags of goodies for them to take home.
End the celebration with themed party favors that make your guests feel like they’ve found treasure.
- Pirate Booty Bags:
- Mini chests filled with chocolate coins, fruit snacks, and small toys.
- Mermaid Magic Bags:
- Glittery bracelets, bubbles, and tiny seashell soaps.
For a personal touch, include a thank-you note in each bag, signed by the birthday star or stars, inviting guests to come back and celebrate again.

Time to Celebrate!
An Under the Sea party that blends the magic of mermaids and the daring spirit of pirates ensures every guest will have a splash-tastic time. Whether you host at your house or outdoors in your yard, these party supplies, games, and decorations will bring everything to life.
Asked your friends for more tips? Share your ideas, too! Tell us your favorite mermaid and pirate mashup detail or something unique you added. From the food to the costumes, every party detail helps create lasting memories for your family and friends. 🎉
Happy Hosting! 😄




