David Lawrence Lemanczyk (/lʌˈmæntʃɪk/ luh-MAN-chik;[1] born August 17, 1950) is a former pitcher with an eight-year Major League Baseball career from 1973 to 1980.

Lemanczyk attended Westhill Senior High School and played college baseball and basketball for the Hartwick Hawks.

He made his MLB debut on April 15, 1973, his only major league game that season, allowing three runs in 2+1⁄3 innings as the Tigers lost 7-0 to the Cleveland Indians.

He made his first career start on August 2, earning his first victory in a 4-1 win over the Milwaukee Brewers as he allowed one run in seven innings.

[4] He currently operates a baseball school for young athletes in Long Island, New York, first in the town of Franklin Square, and is now in Lynbrook.