Lynn Nolan Ryan, Jr. (born January 31, 1947 in Refugio, Texas) is an American former right-handed pitcher in Major League Baseball and current president of the Texas Rangers. Ryan played in a major league record 27 seasons for the New York Mets, California Angels, Houston Astros, and Texas Rangers, from 1966 to 1993.

Ryan, a hard-throwing right-handed pitcher, threw pitches that were regularly recorded above 100 mph (160 km/h), even past the age of 40. The media tagged him, or more specifically his pitching, as "The Ryan Express" (a reference to the 1965 film Von Ryan's Express).

While his lifetime winning percentage was a relatively pedestrian .526, Ryan was an eight-time MLB All-Star, and his 5,714 career strikeouts rank first in baseball history. He leads the runner-up, Randy Johnson , by 1,027 strikeouts as of June 22, 2008. Similarly, Ryan's 2,795 bases on balls lead second-place Steve Carlton by 962—walking over 50% more hitters than any other pitcher in Major League history.

Ryan is the all-time leader in no-hitters with seven, three more than any other pitcher. He is tied with Bob Feller for the most one-hitters, with 12. Ryan also pitched 18 two-hitters.

On February 6, 2008, Ryan was introduced as the president of the Texas Rangers.