The Baltimore Colts season was the fifteenth season for the team in the National Football League. They finished the regular season with a record of 11 wins, 1 loss, and 2 ties, the same record in the Western Conference's Coastal division with the Los Angeles Rams, who defeated them in the regular season finale; the two had tied in mid-October. The Colts lost the new tiebreaker (point differential in head-to-head games) and thus did not make the playoffs, which included only the four division winners.
The Colts' official winning percentage of (based on the NFL's non-counting of ties for such purposes prior to ) is the best in North American professional sports history for a non-playoff-qualifying team. It is also remarkable that the Colts entered the final game undefeated and yet did not qualify for the playoffs.