The 1981 Eastern League season began on approximately April 1 and the regular season ended on approximately September 1.
The Bristol Red Sox defeated the Glens Falls White Sox three games to two to win the Eastern League Championship Series.
| Eastern League - Northern Division[1] | ||||
|---|---|---|---|---|
| Team | Win | Loss | % | GB |
| Glens Falls White Sox | 83 | 52 | .615 | – |
| Holyoke Millers | 68 | 70 | .493 | 16.5 |
| Lynn Sailors | 62 | 76 | .449 | 22.5 |
| Buffalo Bisons | 56 | 81 | .409 | 28.0 |
| Eastern League - Southern Division[1] | ||||
|---|---|---|---|---|
| Team | Win | Loss | % | GB |
| Bristol Red Sox | 79 | 58 | .577 | – |
| Reading Phillies | 76 | 63 | .547 | 4.0 |
| West Haven A's | 71 | 67 | .514 | 8.5 |
| Waterbury Reds | 55 | 83 | .399 | 24.5 |
Notes:
Bristol Red Sox defeated Reading Phillies 2 games to 0.
Bristol Red Sox defeated Glens Falls White Sox 3 games to 2.
| 1981 Eastern League | Regular season | Playoffs |
|---|---|---|
| Total attendance | 620,893 | 10,750 |
| Total games played | 550 | 7 |
| Average attendance per game | 1,129 | 1,536 |
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