BDC Building, Office tower in Hamilton, Ontario, Canada

The BDC Building is an office tower standing at the intersection of Main Street West and MacNab Street South in Hamilton. The structure spans 22 floors and houses four passenger elevators plus an additional service elevator for the parking levels below.

Plans for the tower were announced on 5 August 1969, and the sod was turned that same week. It was built by Cutaia Investments Limited, founded by brothers Angelo, Nicholas and Richard Cutaia, and designed by Roscoe MacIver & Stienstra, the firm of Stanley Maurice Roscoe, who designed Hamilton City Hall in 1960. Mayor Victor Copps led the topping off ceremony on 5 November 1970, and IBM began moving in on 26 March 1971, opening its office the following Monday.

The "BDC" in the tower's name refers to the Business Development Bank of Canada, a Crown corporation wholly owned by the Government of Canada. It lends to and advises Canadian small businesses, with a stated focus on technology and exporting, through 80 branches grouped into 21 key market areas. Its head office is in Montreal, not in this Hamilton tower.

The building sits in a central location in Hamilton and is easily accessible by public transit or car. Its position at a major intersection makes it a useful landmark for navigating the downtown area.

The tower ranks among Hamilton's tallest structures and stands out noticeably in the city's skyline. This prominence gave the original IBM Building considerable visibility when it first rose, a distinction it maintains today.