1970s

As members of the AFC Eastern Division, the Colts won their first AFC game, 16-14, over San Diego on September 20, 1970. After clinching the division title, the Colts topped Cincinnati, 17-0, and Oakland, 27-17, to win the AFC Championship. On January 17, 1971, the Colts defeated Dallas in Super Bowl V, 16-13, on K-Jim O'Brien's 32-yard field goal with five seconds remaining in the game.

In July of 1972, the Colts came under new ownership as Robert Irsay acquired the club from Rosenbloom in exchange for the Los Angeles Rams.

In 1974, two Colts set NFL records as RB-Lydell Mitchell rushed 40 times at the New York Jets and QB-Bert Jones completed 17 consecutive passes versus the Jets. Mitchell led the NFL with 72 receptions. In 1975, Mitchell became the first Colts player with a 1,000-plus yard season, gaining 1,193 yards on 289 rushes.

After a 2-12 record in 1974, Baltimore's fortunes changed with the hiring of Ted Marchibroda as head coach in February of 1975. Marchibroda led the Colts to three consecutive division titles before posting consecutive 5-11 seasons in 1978 and 1979.