Jeffrey Hunter Plympton (born November 24, 1965 in Framingham, Massachusetts) is a former relief pitcher in Major League Baseball who played briefly for the Boston Red Sox during the 1991 season. Listed at 6' 2", 205 lb., Plympton batted and threw right-handed. He was selected by the Boston Red Sox in the 10th round of 1987 draft out of the University of Maine.
Plympton posted a 2-1 record with a 1.06 ERA for Maine in the 1986 College World Series. Overall that summer, he finished 7-2 with a 3.10 ERA, tying Mike Remlinger (Dartmouth) for the most wins.
In four relief appearances for Boston, Plympton recorded a perfect 0.00 ERA without a save, giving up five hits and four walks while striking out two in 5 ⅓ innings of work.
Plympton also played in the Red Sox minor league system from 1987 to 1993. He went 27-29 with a 3.23 ERA and 43 saves in 279 games, including 223 walks, 457 strikeouts, and 502.0 innings pitched.