Mermaid Lagoon is a "port-of-call" (themed land) at Tokyo DisneySea in the Tokyo Disney Resort, and is themed to Disney's The Little Mermaid franchise.

The facade is made to look like the Palace of King Triton and features fanciful seashell-inspired architecture.

This area is unique in that it is mostly indoors and recreates the feeling of being underwater.

Inside Mermaid Lagoon's building, families can ride several flat-rides, explore the Ariel's Playground play area, and it formerly included a live entertainment show.

The area's Mermaid Lagoon Theater then closed on July 1, 2020, and became Ariel's new meet-and-greet location on September 29, 2020.