Gregory Michael Luzinski (born November 22, 1950), nicknamed "the Bull", is an American former professional baseball player.

Luzinski was the 1975 National League (NL) RBI champion and, in 1978 he was named the recipient of the prestigious Roberto Clemente Award for his involvement in local community affairs.

He made his MLB debut on September 9, 1970, at age 19, pinch-hitting for the Phillies in a loss to the New York Mets at Shea Stadium.

Luzinski hit five home runs in five consecutive games, a franchise mark, which has since been tied by Ron Kittle, Frank Thomas (twice), Carlos Lee, and Paul Konerko.

[6] Still a fan favorite in Philadelphia, he started "Bull's Barbecue" in Section 104 at Citizens Bank Park when the Phillies opened the new stadium in 2004.

The barbeque stand was inspired by "Boog's BBQ" at Oriole Park at Camden Yards, and Luzinski can usually be found there until after the seventh inning for all Phillies home games.

The Roberto Clemente Award, given annually to a Major League Baseball player who demonstrates sportsmanship and community involvement, was presented to Luzinski in 1978.