William Lamar Beane III is an American former professional baseball player and current front office executive. He is currently senior advisor to owner John Fisher and minority owner of the Oakland Athletics of Major League Baseball (MLB) and formerly the executive vice president of baseball operations. He is also minority owner of soccer clubs Barnsley of the EFL League One in England and AZ Alkmaar of the Eredivisie in the Netherlands. From 1984 to 1989 he played in MLB as an outfielder for the New York Mets, Minnesota Twins, Detroit Tigers, and Oakland Athletics. He joined the Athletics' front office as a scout in 1990, was named general manager after the 1997 season, and was promoted to executive vice president after the 2015 season.

In sports analytics, sabermetrics is the empirical analysis of baseball, especially baseball statistics that measure in-game activity. Sabermetricians collect and summarize the relevant data from this in-game activity to answer specific questions. The term is derived from the acronym SABR, which stands for the Society for American Baseball Research, founded in 1971. The term "sabermetrics" was coined by Bill James, who is one of its pioneers and is often considered its most prominent advocate and public face.