David Wallace Heaverlo
- Bats Right, Throws Right
- Height 6' 1", Weight 210 lb.
- School Central Washington State College
- High School Moses Lake High School
- Debut April 14, 1975
- Final Game September 27, 1981
- Born August 25, 1950 in Ellensburg, WA USA
Dave Heaverlo was a right-handed relief pitcher.
He attended Moses Lake High School in Moses Lake, Washington, graduating in 1968. He then went on to Central Washington State College, in Ellensburg, WA, where he graduated in 1973. For his baseball contributions, he is a member of the school hall of fame at both his high school and university.
Heaverlo pitched for the San Francisco Giants, the Oakland Athletics, and the Seattle Mariners. He made his major-league debut on April 14, 1975 for the Giants and pitched his last game on September 27, 1981 for the Athletics. He earned a reputation as a jokester. He shaved his head and insisted on keeping his non-roster number 60 as a rookie.
In 1977 he went 5-1 with a 2.55 ERA, and the Giants traded him to Oakland with six other players and $390,000 in return for Vida Blue before the 1978 season. In his career, he made 356 major league appearances, all as a relief pitcher. He pitched 537 career innings and earned 26 saves. His ERA was a respectable 3.41.
He is the father of Jeff Heaverlo, who was a minor league pitcher in the Seattle Mariners' organization.