The Transit Authority of Northern Kentucky (TANK) is the public transit system serving the Northern Kentucky suburbs of Cincinnati, Ohio, located in Kenton County, Boone County and Campbell County, United States.

TANK operates a fleet of 100 fixed route buses and 25 demand response vehicles.

[4] While TANK's primary service area is the three Northern Kentucky counties, all TANK routes also connect with Downtown Cincinnati where riders can transfer to vehicles operated by the Southwest Ohio Regional Transit Authority if necessary.

[5] TANK was founded in 1973 when the privately funded Greenline Bus Company ceased operation, and voters in the three counties elected to publicly fund the transit system.

[7] ATE and its successor First Transit provided management until 2010, when TANK became self-managed.