Mermaid Party Ideas for an Under-the-Sea Birthday

Create a magical mermaid birthday party with under-the-sea decorations, tableware and balloons.

A mermaid party is dreamy, colourful and endlessly photogenic. With a few ocean-inspired touches you can turn any room into an underwater wonderland. Here is how to plan yours.

Mermaid party balloons and decorations
Mermaid party decorations

Choose an Ocean Palette

Blues, teals and aqua work beautifully, accented with pink, purple and gold. Repeat the palette across balloons, tableware and backdrops so the theme feels cohesive.

Decorations That Make a Splash

Layer a balloon garland in ocean colours over a blue backdrop, then add mermaid tails, shells and fishing net. Our mermaid party supplies include everything you need.

Table Styling

Use mermaid-themed plates, cups and napkins over a blue or turquoise tablecloth. Add a mermaid cake topper and a few shells for a table that looks straight out of the sea.

Favours and Activities

Temporary tattoos, shell-shaped stickers and mini bubbles make perfect favours. A treasure hunt or a ‘pin the tail on the mermaid’ game keeps little guests entertained.

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2026-10-10 09:33:13

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