Celebrate your little one with a magical mermaid theme birthday party that is filled with sparkle, fun, and unforgettable memories!
For my daughter’s birthday, we created a magical mermaid theme birthday party. Celebrating three under-the-sea was both fun and memorable. The decor was simple yet intentional, incorporating mermaids, ocean-inspired details, and a playful balloon arch.
If your little one loves mermaids and sea adventures, this theme is the perfect choice! I’m sharing all the details, tips, and tricks to help you create your own magical mermaid party and make it a day to remember. Let’s dive in!
shop all the party details!
Mermaid Birthday Invitations
Shop Invite: Mermaid Invitation
The perfect party starts with the perfect invite, and for our magical mermaid-themed celebration, I turned to Etsy to find just the right design. Mermaid party invitations are the first glimpse your guests will get of the under-the-sea adventure you’re planning, so why not make them as magical as the day itself? Whether you prefer a digital option for easy sharing or a beautifully printed design to hand-deliver, Etsy offers a treasure trove of creative, customizable options. I went with is pretty mermaid invite and it fit in with the theme perfectly.
Mermaid Theme Birthday Party Decorations
shop: Meri Meri Mermaid party set / Shell Plates / seahorse napkins / Purple Glitter Table Cloth / “Let’s Shellebrate” banner
Transforming our space into an underwater wonderland was easy with the beautifully curated Meri Meri Mermaid Party Set. This all-in-one kit was perfect for creating a cohesive and stylish mermaid-themed celebration without the stress of piecing everything together. It has whimsical mermaid illustrations, iridescent details, and pastel hues inspired by the sea, the set includes plates, napkins, and cups that are so pretty. The scalloped edges, shimmering foil accents, and playful seashell designs are perfect for a mermaid-themed birthday party.
We paired the set with extra shell-shaped plates and seahorse-shaped napkins for added charm. A light purple glitter tablecloth elevated the table decor, complemented by a “Let’s Shellebrate” banner and a whimsical balloon arch for the perfect finishing touches.
Mermaid Balloon Arch
shop: balloon arch ( similar) / Purple Mermaid Tale / “Let’s Shellebrate” banner
No party is complete without balloons, and a balloon arch is the ultimate way to create a memorable “wow” moment! For our mermaid celebration, I teamed up with a local balloon artist to design a custom garland that perfectly complemented the Meri Meri party set. We chose a dreamy color palette of mint, light purple, soft pink, apricot orange, and white, accented with a striking purple mermaid tail.
The arch became a stunning focal point and served as a picture-perfect backdrop for photos. Not only did it elevate the party’s aesthetic, but it also proved to be an affordable and stylish decoration that made a big splash!
Mermaid Birthday Party Cake
shop: Meri Meri Mermaid party set (topper included) / Meri Meri Mermaid Cake Topper ( on its own) / Mermaid Number Candle
No mermaid party is complete without a show-stopping cake, and ours was truly the centerpiece of the dessert table! I used the whimsical Meri Meri Mermaid Cake Toppers (included in their party set) to bring the under-the-sea theme to life effortlessly. These charming toppers, featuring colorful mermaids, seashells, and coral, added a playful yet elegant touch.
To keep things simple, I had the cake custom-made by a local bakery. We chose a seafoam-green buttercream finish, accented with delicate wave-like piping and edible seashells for extra flair. We added an adorable mermaid-themed number three candle on top. The combination of the custom cake and Meri Meri toppers created a magical design that wowed our guests and fit perfectly with the overall party theme. Whether you’re baking at home or working with a bakery, these toppers make it easy to achieve a picture-perfect cake that’s as delicious as it is beautiful!
Mermaid Party Favor
shop: Meri Meri mermaid Stickers / Cake pop sticks & bags / Shell Sprinkles / cake stands ( Similar)
For a sweet and memorable take-home treat, we created custom white cake pops that perfectly complemented the mermaid theme. Each cake pop was decorated with shimmer shell sprinkles adding a magical touch to these bite-sized desserts. To package them, we used clear treat bags adorned with charming Meri Meri Mermaid Stickers and tied them off with vibrant teal ribbon for an extra pop of color.
The cake pops were beautifully displayed on a scalloped cake stand, doubling as a delightful table decoration during the party. These DIY favors were not only fun to make but also a hit with guests of all ages. Whether you’re looking for an edible party favor or an eye-catching addition to your dessert table, these homemade treats are a thoughtful, budget-friendly option that brings a touch of creativity and sweetness to your celebration!
Mermaid Birthday Party Outfit
shop: mermaid skirt / mermaid tail hair clip
Don’t forget the birthday outfit! For a shimmering look that made our little one feel like the star of the ocean, we chose a sparkly mermaid skirt paired with an adorable mermaid tail hair clip. This outfit sparkles and shines, creating an unforgettable look that’s both whimsical and fun.
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