Michael McKinnell (born 1935) is an American architect and co-founder of the Kallmann McKinnell & Wood architectural design firm. In 1962, McKinnell, who was a Columbia University graduate student at the time, and Columbia professor Gerhard Kallmann submitted the winning design for Boston City Hall, which opened 1968. McKinnell and Kallman moved to Boston shortly after winning the competition and founded their firm, now known as Kallmann McKinnell & Wood, in 1962.