Adam Donald Haseley (/ˈheɪzliː/ HAYZ-lee;[1] born April 12, 1996) is an American professional baseball outfielder who is a free agent.

He has previously played in Major League Baseball (MLB) for the Philadelphia Phillies and Chicago White Sox.

At the age of twelve, Haseley played in the Cooperstown Dreams Park National Invitational Tournament with his Little League team.

[6] During his senior season, Haseley suffered a perforated eardrum on his way home from a tournament in North Carolina, an issue that continued into his college career.

[9] Haseley made his collegiate debut, for the University of Virginia, on April 1, 2015, in a relief appearance against VMI.

[11] In his sophomore year, Haseley had a 9–3 win–loss record with a 1.73 earned run average (ERA) as a starting pitcher, while batting .304.

[9] Haseley was also a finalist for the John Olerud Award, which recognizes college baseball's best two-way player.

[20] Haseley made his professional debut with the Rookie Gulf Coast League Phillies, batting in the third spot and going 3-for-4.

[23][22] Haseley was promoted to the Double-A Reading Fightin Phils, with whom in 136 at bats he hit .316/.403/.478 with 6 home runs and 17 RBIs.

[32] On April 14, 2021, the Phillies announced that Haseley would be stepping away from the team for an "undetermined amount of time" for personal reasons and placed him on the restricted list.

He spent the bulk of the year in Charlotte, playing in 110 games and hitting .239/.305/.412 with 15 home runs, 63 RBI, and 18 stolen bases.