1991 Eastern League season

The 1991 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 3 games to 0 to win the Eastern League Championship Series.

Standings
Note: 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

 * The Albany-Colonie Yankees defeated the Hagerstown Suns 3 games to 0.
 * The Harrisburg Senators defeated the Canton–Akron Indians 3 games to 1.

Championship Series

 * The Albany-Colonie Yankees defeated the Harrisburg Senators in the ELCS 3 games to 0.