John Daniel Lazar (born November 14, 1943) is a former Major League Baseball pitcher. He pitched in parts of two seasons, 1968 and 1969, for the Chicago White Sox. An alum of Indiana State University, Lazar was elected to the ISU Hall of Fame in 2008 and inducted in 2009.
Twice he was named an All-ICC pitcher for the Sycamores; he led them in strikeouts and wins from 1963–65, he continues to hold the strikeouts record (single-game) at 16.