William Joseph Cunnane (born April 24, 1974) is a former right-handed Major League Baseball pitcher.

He graduated from Clarkstown High School North in New City, New York in 1992, where he played baseball and ran cross country.

Originally signed by the Florida Marlins as an undrafted free agent in 1992, Cunnane spent four seasons mostly as a starter in the minors before making his major league debut.

On December 9, 1996, Cunnane was selected by the San Diego Padres in the Rule 5 Draft.

He finished the year with the Triple-A Round Rock Express, pitching to a 3.45 ERA over 27 games.

Cunnane signed with the Bridgeport Bluefish of the Atlantic League of Professional Baseball for the 2006 season.

He pitch in 6 games in 2006 with the Triple-A Memphis Redbirds, carrying a 6.92 ERA before his release on June 26, 2006.