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The Pittsburgh Steelers are a professional American football team that is based in Pittsburgh, Pennsylvania. They are members of the Northern Division of the American Football Conference (AFC), in the National Football League (NFL). The Steelers are the oldest and most championed franchise in the AFC. The team has appeared in six Super Bowls and, along with the San Francisco 49ers and Dallas Cowboys, is one of three teams to have won the Super Bowl five times. They have appeared in thirteen Conference Championship Games and have hosted more conference championship games than any other NFL franchise. They are the only team in NFL playoff history to win a Super Bowl after being seeded sixth in the playoffs, winning three consecutive games on the road followed by a Super Bowl XL victory in Detroit on February 5, 2006 against the Seattle Seahawks.

Originally named the Pittsburgh Pirates, the team joined the NFL in 1933 when owner Art Rooney, Sr. paid a US$2,500 franchise fee to the league. Prior to 1933, strict state blue laws had prevented sporting events from taking place on Sundays, when most NFL games were scheduled.

The team was renamed the Steelers in 1940, after the city's prominent steel industry. A fan suggested the name in a contest held by the Pittsburgh Post-Gazette and the team.