International Mermaid Day 2025. International day for dialogue among civilizations (a/res/78/286) 10 jun. It’s for lovers of the fabled creature that’s appeared in literature, mythology, music, films, and pop culture for a long time.

Disney also confirmed that seasonal and themed events will be. March 29 is international mermaid day, which only began in 2018 as a promotion for the freeform network’s television show siren, now in its fourth season.