1989 Eastern League season

The 1989 Eastern League season began on approximately April 1 and the regular season ended on approximately September 1.

The Albany/Colonie Yankees defeated the Harrisburg Senators three games to one to win the Eastern League Championship Series.

Standings
Notes:
 * Green shade indicates that team advanced to the playoffs
 * Bold indicates that team advanced to ELCS
 * Italics indicates that team won ELCS

Semi-finals Series

 * Albany/Colonie Yankees defeated Reading Phillies 3 games to 1.
 * Harrisburg Senators defeated Canton–Akron Indians 3 games to 2.

Championship Series

 * Albany/Colonie Yankees defeated Harrisburg Senators 3 games to 1.