William J. Rennie (September 12, 1891 – December 10, 1964) was an American football and basketball coach.
[1] Ost was also the head basketball coach at Hillsdale from 1920 to 1922, tallying a mark of 12–16.
On August 12, 1920, Rennie married Elizabeth Adelaide Goodrich in Hillsdale.
Later regarded as an expert in fly fishing, he died in 1964 and was buried in Hillsdale.
This biographical article relating to a college football coach first appointed in the 1920s is a stub.