The Marin, previously the Main Seneca Building, and originally known as the Marine Midland Trust Company Building or the "Marine Trust Building," is a 17-story Renaissance Revival style highrise in downtown Buffalo, New York. The building was previously the headquarters for Marine Midland Bank before the bank constructed One Marine Midland Center at 1 Seneca Tower, the tallest building in Buffalo. It is located in the Joseph Ellicott Historic District.

Marine Midland Bank was an American bank formerly headquartered in Buffalo, New York, with several hundred branches throughout the state of New York. In 1998, branches extended to Pennsylvania. It was acquired by HSBC in 1980, and changed its name to HSBC Bank USA in 1999. As a result of several transactions since the turn of the millennium, much of what was once Marine Midland is now part of KeyBank with the exception of Downstate New York and Pennsylvania, that is now part of Citizens Bank. Branches in Seattle are part of Cathay Bank.