Antonio Ramiro Romo (born April 21, 1980) is an American former professional football quarterback who played in the National Football League (NFL) for 13 seasons with the Dallas Cowboys. He played college football for the Eastern Illinois Panthers, where he made an Ohio Valley Conference championship appearance in 2001 and won the Walter Payton Award the following year. Romo signed with the Cowboys as an undrafted free agent in 2003.

Beginning his career in a backup role, Romo served as the Cowboys' primary starter from 2006 to 2015. He led the Cowboys to four postseason appearances during his tenure, while also receiving Pro Bowl honors amid each playoff run. Romo retired after the 2016 season after a preseason back injury caused him to lose his starting position to rookie backup Dak Prescott. Upon retiring, Romo was hired by CBS Sports to become the lead color analyst for its NFL telecasts.

Romo holds several Cowboys team records, including passing touchdowns, passing yards, most games with at least 300 passing yards, and games with three or more touchdown passes. He also held a higher passer rating in the fourth quarter than any other NFL quarterback from 2006 to 2013. Romo was less successful in the postseason, winning only two of the six playoff games he appeared in and never advancing beyond the divisional round. He was inducted into the College Football Hall of Fame in 2021.

Romo was born in San Diego, California, to Ramiro Romo Jr. and Joan Jakubowski. A "Navy brat", he was born while his father was stationed at the San Diego U.S. Naval Base. The Romos later returned to Burlington, Wisconsin, where Ramiro worked as a carpenter and construction worker and Joan worked as a grocery store clerk. Romo played baseball as a child and was selected to the Little League All-Star team.

Romo's paternal grandfather, Ramiro Romo Sr., emigrated from Múzquiz, Coahuila, Mexico, to San Antonio, Texas, as an adolescent. The elder Romo cites Tony's success as an example of the possibilities afforded to immigrants in the United States: "I've always said this is a country of opportunities. If you don't get a job or an education, it's because you don't want to." Romo's mother has German and Polish ancestry.

Romo started as quarterback for the Burlington High School Demons beginning as a junior (1996 season). In the 1997 season, Romo and the Demons finished with a 3–6 record, though he earned several honors, including the All-Racine County football team and Wisconsin Football Coaches Association All-State first-team honors. Romo also was a starter on the Burlington High School varsity basketball team and also played golf and tennis. In 1998, he joined Caron Butler on the All-Racine County (Wisconsin) team. With per-game averages of 24.3 points, 8.8 rebounds and 4.7 assists, Romo was sought by some mid-major basketball schools in the NCAA such as Wisconsin-Green Bay. He graduated from Burlington High School in 1998, with his 1,080 points being the all-time scoring record for the Burlington basketball varsity.

Romo attended Eastern Illinois University in Charleston, Illinois, where he played for the NCAA Division I-AA Eastern Illinois Panthers football team and was a member of Sigma Pi. As a sophomore in 2000, Romo ranked second in Division I-AA in passing efficiency, completing 164-of-278 (59%) passes for 2,583 yards and 27 touchdowns. After the season, he was honored as an All-America honorable mention, an All-Ohio Valley Conference member, and the OVC Player of the Year.

As a junior, Romo led Division I-AA in passing efficiency, completing 138-of-207 passes for 2,068 yards and 21 touchdowns.