Ballena Marine National Park (Spanish: Parque Nacional Marino Ballena), is a national park of Costa Rica, part of the Osa Conservation Area created as a safe area for humpback whale migration, hence its name, as Ballena is the Spanish word for whale.

The park was created by executive decree Nº 21294-MIRENEM on 9 June 1992.

[1] From December to April, the park is visited by migrating humpback whales who come to breed in the warmer tropical waters off the Central American coast.

From June to November, the whales migrate north to the West Coast of the United States and southern British Columbia, where they feed.

This Costa Rican protected area article is a stub.