Aaron Michael Heilman (born November 12, 1978) is an American professional baseball player and pitcher in Major League Baseball (MLB) who plays for the Arizona Diamondbacks. Heilman was drafted by the New York Mets out of Notre Dame in 2001. He came up through the Mets system as a starting pitcher but was converted to a relief pitcher in 2005. After the 2008 season, Heilman was traded to the Seattle Mariners, but was traded a month later to the Chicago Cubs.
Heilman was born in Logansport, Indiana and attended Logansport High School, where he was a letterman in baseball. As a senior, he was a team M.V.P. and an All-State selection. Heilman graduated from Logansport High School in 1997.
After a successful college career at the University of Notre Dame, he was selected by the New York Mets in the first round of the 2001 amateur draft with the 18th overall pick. Heilman was a management information systems and philosophy major in the Mendoza College of Business at the University of Notre Dame.