John Robert Marzano (February 14, 1963 – April 19, 2008) commonly referred to as Johnny Marz was an American catcher in Major League Baseball who played from 1987 to 1998 for the Boston Red Sox, Texas Rangers and Seattle Mariners, generally as a backup catcher. He was a member of division champions with the 1988 and 1990 Red Sox and the 1997 Mariners, batting .287 for the latter team.

Born in Philadelphia, Pennsylvania, Marzano graduated from Central High School, and briefly attended Holy Family College, studying radiologic technology. He also attended and played for the Owls of Temple University from 1982 to 1984. Marzano played as a catcher for the Temple Owls baseball team before getting drafted in the 1st round, 14th overall, in the 1984 entry draft by the Boston Red Sox of the American League.

He was a member of the silver medal-winning US Baseball Team at the 1984 Olympic Games. He founded the Marzano Baseball Academy in 1991.

Marzano became a cult hero in Seattle when he threw a haymaker at New York Yankees outfielder Paul O'Neill during a game in 1996. He is well known in Seattle for this incident which occurred after O'Neill complained to the umpire about a pitch that was high and inside.

Marzano is a comune (municipality) in the Province of Pavia in the Italian region Lombardy, located about 25 km southeast of Milan and about 14 km northeast of Pavia. As of 31 December 2004, it had a population of 1,125 and an area of 9.2 km².

Marzano borders the following municipalities: Ceranova, Lardirago, Roncaro, Torre d'Arese, Torrevecchia Pia, Valera Fratta, Vidigulfo, Vistarino.

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