Jeffrey Allan Nelson (born November 17, 1966 in Baltimore, Maryland), was a middle relief pitcher. His nickname in High School was "Patty". He batted and threw right-handed. Nelson retired on January 12, 2007, the same day he signed a minor league contract with the New York Yankees.
Drafted by the Los Angeles Dodgers in the 22nd round of the 1984 amateur draft; he signed June 21, 1984.
In his Major League career Nelson pitched in 798 games with a 48-45 record, and with runners in scoring position and two out he held batters to a .191 batting average. In 55 post-season games (second all-time behind former teammate Mariano Rivera), he compiled a 2-3 mark with 62 strikeouts and a 2.65 ERA in 54.1 innings. Among hitters whom he dominated most were Troy Glaus, who in 14 at bats was hitless with 11 strikeouts.