William George McGimsie (June 7, 1880 – October 28, 1968) was a Canadian amateur ice hockey player. He played six seasons as a centre for the Rat Portage/Kenora Thistles between 1901 and 1907. A leading offensive player of his era, McGimsie led the Manitoba and North West Hockey League with 28 goals in 8 games in 1904–05. He was a member of three Thistles' teams that challenged for the Stanley Cup, winning the national championship in 1907. His career was ended when he suffered a separated shoulder in an exhibition game. McGimsie was inducted into the Hockey Hall of Fame in 1963.