William John Speas, Sr. (August 17, 1887 – January 13, 1969) was a long-time minor league baseball player and manager.
Speas began his professional career as an 18-year-old in 1906, suiting up for the Mansfield Giants of the Ohio–Pennsylvania League.
It was in the Mississippi Valley League that Speas posted the best offensive statistics of his career.
In 1922 and 1925, he led the Cedar Rapids Bunnies to first-place finishes in the Mississippi Valley League.
A similar situation unfolded in 1927, when he led the Dubuque Dubs to a first-place finish in the Mississippi Valley League.