William George Muir (February 1, 1895 – January 5, 1967) was an American football, basketball, and baseball coach.

[2][3] He served as the head football coach at Northern Illinois University from 1923 to 1925, compiling a record of 11–9–3.

Muir was also the head basketball coach at Northern Illinois from 1923 to 1926 and the head baseball coach at the school from 1924 to 1926.

Prior to coming to Northern Illinois, he had taught and coached in Kansas, Texas, and in Decatur, Illinois.

This biographical article relating to a college football coach first appointed in the 1920s is a stub.