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My daughter chose a mermaid theme for her 8th birthday party. I found so many adorable mermaid birthday decorations at various retailers, and I’m excited to share some of those ideas with you.
Mermaid party decorations
I ordered a 200-piece mermaid party decoration set and I liked everything that was included except for the Happy Birthday banner, which was missing parts. It came with a blue backdrop that worked perfectly to cover our canvas images in our dining room.
It included:
- A tablecloth
- Happy birthday banner
- Mermaid banner
- 2 temporary tattoos
- Cake topper
- Headband
- 2 keychains
- 2 shell foil balloons
- 2 mermaid tail foil balloons
- 16 straws
- 12 paper flower balls
- 12 cupcake toppers
- 12 Latex balloons
- 12 cupcake cups
- 16 cups
- 16 cutlery sets
- 16 napkins
- 32 plates
Birthday mermaid shirt
V wore a white birthday mermaid shirt for her party. It also comes in black. I also purchased matching shirts that said Mermaid Dad, Mermaid Mom, and Mermaid Sister.
Custom mermaid birthday cake image
I also order a mermaid theme cake image to put on a Costco cake for her party. Unfortunately, I thought this was a physical item, but it was just the image, which I was told to have printed at a bakery.

I also found mermaid decorations at Party City.
Hope you found these ideas helpful in planning your own mermaid birthday party!