Miami Dolphins

The Dolphins were founded by Joe Robbie, an attorney and politician, and Danny Thomas, an actor and comedian. They began play in the AFL in 1966. The region had not had a professional football team since the days of the Miami Seahawks, who played in the All-America Football Conference in 1946, before becoming the first incarnation of the Baltimore Colts. For the first few years, the Dolphins' full-time training camp and practice facilities were at Saint Andrew's School, a private, boys boarding prep school in Boca Raton. Miami joined the NFL as a result of the 1970 AFL–NFL merger.

The team played in its first Super Bowl in Super Bowl VI, losing to the Dallas Cowboys, 24–3. The following year, the Dolphins completed a perfect season, culminating in a victory in Super Bowl VII. The Dolphins then repeated as champions by winning Super Bowl VIII, becoming the first team to appear in three consecutive Super Bowls, and the second team (the first AFL/AFC team) to win back-to-back championships. Miami later appeared in Super Bowl XVII and Super Bowl XIX, losing both games.

For most of their early history, the Dolphins were coached by Don Shula, the most successful head coach in professional football history in terms of total games won. Under Shula, the Dolphins posted losing records in only two of his 26 seasons as the head coach. During the period spanning 1983 to the end of 1999, quarterback Dan Marino became one of the most prolific passers in NFL history, breaking numerous league passing records. Marino led the Dolphins to five division titles, 10 playoff appearances, and an appearance in Super Bowl XIX before retiring following the 1999 season.

Since Marino's retirement, they have experienced mediocre levels of success and have just six playoff appearances (2000, 2001, 2008, 2016, 2022, and 2023) and two division titles (2000 and 2008) with one playoff win. They currently have the longest postseason win drought in the NFL, with their most recent playoff win coming in the 2000 season.

In December 2024, the Dolphins, led by owner Stephen M. Ross, became one of the first teams in NFL history to sell part of their team to outside private equity investors. 13% of the Dolphins franchise was sold at a valuation of $8.1 billion, including 10% to the American investment group Ares Management.