Harold Everette Kolstad (born June 1, 1935) is a former pitcher in Major League Baseball who played from 1962 through 1963 for the Boston Red Sox. Listed at 5 ft 9 in (1.75 m) and 190 pounds (86 kg), Kolstad batted and threw right-handed. He was signed by Boston as a free agent in 1957 out of the San Jose State University.
In a two-season MLB career, Kolstad posted a 0–4 win–loss mark with 42 strikeouts and a 6.59 ERA in 34 appearances, including two starts, two saves and 72⅓ innings pitched. He surrendered 81 hits and 41 bases on balls.
In 1966, Kolstad joined the faculty at Leigh High School in San Jose, California as a teacher and coach. He remained there until his retirement in 1990.