William Henry Greason (born September 3, 1924) is an American former professional baseball pitcher who years later became a Baptist minister in Birmingham, Alabama.

[4] In 1950 and 1951, Greason also played for the Charros de Jalisco of the independent (outside "Organized Baseball"), racially integrated Mexican League.

[3] Another successful year at Oklahoma City in 1953 led to Greason's acquisition by the St. Louis Cardinals of Major League Baseball, where he would become the team's second African-American player, after Tom Alston.

He spent the remainder of his professional baseball career in the upper levels of the minor leagues in the Cardinal farm system, retiring after the 1959 campaign.

After his church was infamously bombed by the Ku Klux Klan, killing four children, on September 15, 1963, he studied for the ministry at Birmingham Baptist Bible College and Samford University.