Grand Marais/Cook County Seaplane Base (FAA LID: 0G5) is a county-owned, public-use seaplane base located seven miles (11 km) northwest of the central business district of Grand Marais, a city in Cook County, Minnesota, United States.

It is located on the shore of Devil's Track Lake and was formerly part of Devil's Track Municipal Airport (FAA: GRM). That airport had a runway which closed after the opening of Grand Marais/Cook County Airport (FAA: CKC), located one mile (1.6 km) to the north.