FUNDY, an army acronym.

Bay of Fundy, an Atlantic Canadian bay home to the highest tides in the world

Fundy Isles, a provincial electoral district in New Brunswick, Canada

Fundy National Park, a Canadian National Park on the Bay of Fundy

Fundy Royal, a Canadian federal electoral district

Fundamentalism, specifically a pejorative term for Fundamentalist Christianity. This is an alternative spelling of "Fundie".