Jason Calvin Garrett (born March 28, 1966) is an American former professional football player and coach in the National Football League (NFL). He was most notably the head coach of the Dallas Cowboys from 2010 to 2019.

Garrett played college football for the Princeton Tigers. He played in the NFL for the Cowboys (winning three Super Bowls as the backup quarterback to Troy Aikman), New York Giants, Tampa Bay Buccaneers, and Miami Dolphins. Garrett began his coaching career as the quarterbacks coach for the Dolphins before serving as offensive coordinator and assistant head coach for the Cowboys.

In 2022, Garrett became a color commentator for NBC Sports. He provides regular commentary for NBC Sports' coverage of Notre Dame football, and is an alternate color commentator for the NFL on NBC. Garrett is also a studio analyst for NBC's NFL pregame show Football Night in America.

Garrett attended kindergarten through second grade at Holy Cross school in Rumson, New Jersey. He went to prep school at University School in Hunting Valley, Ohio, and was a letterman in football, basketball, and baseball. As a senior, Garrett won All-League honors as a quarterback and safety. He graduated from University School in 1984.

Garrett was accepted to Princeton University, where he began as the starting quarterback of the freshman team, registering 64 completions on 116 attempts for 996 yards. Garrett transferred to Columbia University when his father, Jim, became the head coach in 1985. Following his father's resignation after Columbia's 0–10 1985 season, Garrett and his brothers (Judd and John) transferred to Princeton, although none played varsity in 1986 for different reasons (Jason was an ineligible transfer).

Garrett sat out the 1986 season because of the transfer rules while focusing on running the scout team, which included his brothers. The next year, as a junior, Garrett was named the starting quarterback. Although he piloted Princeton to a win against his former team, Columbia (a loss that gave Columbia the Division I record for straight losses, at 35), Garrett was also involved in a losing effort against them as a senior, snapping Columbia's by then 44-game losing streak. He received the Asa S. Bushnell Cup as the Ivy League Player of the Year. Garrett earned a degree in history in 1989, with a senior thesis on "The Revolt of the Black Athlete as Initiated by Harry Edwards".

Garrett finished his college career completing 366 of 550 passes (66.5%) for 4,274 yards and 20 touchdowns. At the time, he was ranked in the categories: lowest pass interception percentage (1.8% – school record), total yards of offense (4,555 – second in school history), total yards of offense in a season (2,485 – third in school history), most passing yards (4,274 – second in school history), most passing yards in a season (2,217 – fourth in school history), most completions (366 – second in school history), most completions in a season (204 – third in school history), most touchdown passes (20 – tied for fourth). Garrett continues to hold the Ivy League career record for completion percentage with 66.5% (366/550) and his 1988 percentage of 68.2% (204/299) stood as the league record until 2000, when Gavin Hoffman posted a 70.5% mark.

Garrett was signed as an undrafted free agent by the New Orleans Saints after the 1989 NFL draft and was eventually signed to the practice squad. On September 3, 1990, he was waived by the Saints and spent most of the year working as a coaching assistant for Princeton.