Lynn Swann was selected by the Pittsburgh Steelers with the 21st pick of the first round in the 1974 NFL Draft. The Steelers draft class of '74 is considered one of the best in NFL history and included 4 eventual Hall of Famers: Lynn Swann, John Stallworth, Mike Webster, and Jack Lambert.

Swann spent his entire NFL career with the Steelers and wore the jersey number 88. As a rookie, he led the NFL with 577 punt return yards, a franchise record and the fourth most in NFL history at the time. He went on to win a championship ring with the Steelers in Super Bowl IX but did not record any receptions in the tough defensive struggle (Pittsburgh quarterback Terry Bradshaw completed only nine passes in the game). However, he returned 3 punts for 34 yards.

The following season became the highlight of Swann's career. He caught 49 passes for 781 yards and a league-leading 11 touchdowns. In the AFC title game against the Oakland Raiders George Atkinson lit him up with a vicious hit. He suffered a severe concussion that forced him to spend two days in a hospital, but surprised many by returning to play for Super Bowl X. Swann recorded four catches for a Super Bowl record 161 yards and a touchdown in the game, assisting the Steelers to a 21–17 win and becoming the first wide receiver to earn Super Bowl MVP honors.

Three seasons later the Steelers made it to Super Bowl XIII. In the game, Swann caught seven passes for 124 yards and scored the final touchdown for Pittsburgh in their 35-31 win over the Dallas Cowboys. The Steelers made it back to the Super Bowl again in the 1979 season, and Swann caught five passes for 79 yards and a touchdown in Pittsburgh's 31-19 win in Super Bowl XIV. Overall, Swann gained 364 receiving yards and 398 all-purpose yards in his four Super Bowls, which were both Super Bowl records at the time.

Lynn Swann retired after the 1982 season with four Super Bowl rings. He amassed 336 career receptions for 5,462 yards and 51 touchdowns, along with 72 rushing yards, a rushing touchdown, and 739 punt return yards and a touchdown. Swann was a pro bowl selection three times (1975, 1977, 1978) and was selected on the 1970's all-decade team.He was also selected to the NFL 1970's All-Decade Team by Hall of Fame voters.

Upon retirement in January, 1983, Swann began his career full-time with ABC Sports, which ended after the 2006 Orange Bowl. Swann has broadcast a variety of events as a host, reporter, and analyst.