1983 Eastern League season

The 1983 Eastern League season began on approximately April 1 and the regular season ended on approximately September 1.

The New Britain Red Sox defeated the Lynn Sailors 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
Lynn Sailors defeated Buffalo Bisons 2 games to 0.

New Britain Red Sox defeated Reading Phillies 2 games to 1.

Championship Series
New Britain Red Sox defeated Lynn Sailors 3 games to 1.