William Louis Tozer (July 3, 1882 – February 23, 1955), was a Major League Baseball pitcher who played in 1908 with the Cincinnati Reds.

He batted and threw right-handed.

Tozer had a 0–0 record, with a 1.69 ERA, in four games, in his one-year career.

He was born in St. Louis, Missouri and died in Belmont, California.

This biographical article relating to an American baseball pitcher born in the 1880s is a stub.