Roger Eugene Nelson (born June 7, 1944) is an American former professional baseball pitcher. Nelson pitched all or part of nine seasons in Major League Baseball between 1967 and 1976 with a record of 29 wins, 32 losses, and 5 saves. Born in Altadena, California, the right-hander was listed as 6 feet 3 inches (1.91 m) tall and 200 pounds (91 kg). He attended Mount San Antonio College.