Adam Daniel Greenberg (born February 21, 1981) is an American former professional baseball player. He was an outfielder for the Chicago Cubs of Major League Baseball in 2005 and was best known for being hit in the head in his major league debut on the first pitch of his first plate appearance. He suffered a compound skull fracture from the pitch.

Greenberg was one of two players in league history to be hit by a pitch in their only plate appearance without ever taking the field. However, a successful online petition drive in 2012 led to him getting signed by the Miami Marlins to a one-day contract. He had one at bat for the Marlins and struck out on three pitches. He agreed to a minor league contract with the Baltimore Orioles for 2013, but the option wasn't pursued.

He also played parts of five seasons with the Bridgeport Bluefish of the Atlantic League of Professional Baseball near his hometown.

Greenberg is the son of Wendy and Mark Greenberg. He is Jewish. He attended Guilford High School in Guilford, Connecticut. He was a four-year letterman on Guilford's baseball, basketball, and soccer teams.

He was baseball team captain as a junior and senior, four-time All-conference and all-area, and was the first player in Connecticut history to be named to four all-state teams.

He was also soccer team captain for 1998 and 1999, and was a striker and four-year starter. Greenberg was a three-time all-conference, all-area, and all-state selection. He was named all-New England and All-America in 1998, during which season he set the school season record with 17 assists. He was also the team and area most valuable player in 1998, and helped lead Guilford to the state soccer title in 1996. He holds the school record for career assists, with 33.

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