Marc Jason Kroon (born April 2, 1973) is an American former right-handed relief pitcher.

[1] On July 7, 1995, Kroon made his Major League debut with the San Diego Padres.

He came out of retirement and joined the Anaheim Angels organization in 2003 after coach Mike Butcher's brother-in-law saw him giving a pitching lesson in a park.

Kroon was later signed by the Yomiuri Giants along with two other major non-Japanese free agents: former Tokyo Yakult Swallows standouts Seth Greisinger, and Alex Ramirez.

[citation needed] Kroon signed a minor league contract with an invitation for spring training with the San Francisco Giants in 2011.