David Percy Pagan (born September 15, 1949) is a former professional baseball pitcher. He played all or part of five seasons in Major League Baseball from 1973 until 1977, and was a member of the Seattle Mariners' 1977 inaugural season roster.
Pagan joined the New York Yankees organization in 1970. After three seasons in their farm system, he received his first call up to the majors in 1973, making the start in the second game of a July 1 double header with the Cleveland Indians. After escaping a jam in the first inning, Pagan was pulled in the second with the bases loaded and nobody out, and one run already in. He was far more effective in a second appearance made in relief on July 7 before returning to the minors. After compiling an 8–5 record and 2.03 earned run average between the West Haven Yankees and Syracuse Chiefs, he rejoined the Yankees that September.
Pagan split the next two seasons between the Yankees and Syracuse. He made the opening day roster for the first time in 1976 as a member of the Yankees' bullpen, but made just two starts with the club prior to a block buster trade in which he, Rick Dempsey, Tippy Martinez, Rudy May and Scott McGregor went to the Baltimore Orioles for Doyle Alexander, Jimmy Freeman, Elrod Hendricks, Ken Holtzman and Grant Jackson.
After going 1–4 with a 5.98 ERA the rest of the way for Baltimore, he was selected by the Seattle Mariners in the 1976 Major League Baseball expansion draft. He was traded to the Pittsburgh Pirates for a player to be named later on July 27, and made one appearance with the club that September against the New York Mets. After two more seasons playing minor league ball in the Pirates organization, he retired.