1990 Eastern League season

The Eastern League season [|began] on approximately April 1 and the regular season ended on approximately September 1.
The London Tigers defeated the New Britain Red Sox three games to zero to win the Eastern League Championship Series.

Regular season

Standings

Notes:

Playoffs

Semi-finals Series

London Tigers defeated the Canton–Akron Indians 3 games to 2.
New Britain Red Sox defeated the Albany/Colonie Yankees 3 games to 2.

[|Championship Series]

London Tigers defeated the New Britain Red Sox 3 games to 0.