| Roy Heiser | |
| Position: | Pitcher |
| Birth Date: | 22 June 1942 |
| Birth Place: | Baltimore, Maryland |
| Bats: | Right |
| Throws: | Right |
| Debutleague: | MLB |
| Debutdate: | September 2 |
| Debutyear: | 1961 |
| Debutteam: | Washington Senators |
| Finalleague: | MLB |
| Finaldate: | September 11 |
| Finalyear: | 1961 |
| Finalteam: | Washington Senators |
| Statleague: | MLB |
| Stat1label: | Win–loss record |
| Stat1value: | 0–0 |
| Stat2label: | Strikeouts |
| Stat2value: | 1 |
| Stat3label: | Earned run average |
| Stat3value: | 6.35 |
| Teams: | |
Leroy Barton Heiser (born June 22, 1942) is an American former professional baseball player. A right-handed pitcher, he got into three games in Major League Baseball for the Washington Senators in, his first season in organized baseball. He was born in Baltimore, Maryland, stood 6feet tall and weighed .
Heiser graduated from Catonsville High School and attended the University of Maryland. He was signed by the expansion Senators during their maiden, 1961 season and spent much of the campaign in the Class D Appalachian League, but was recalled by Washington in September. In three relief appearances, largely in a mop-up role, Heiser allowed six hits and nine bases on balls in 5 innings pitched, with one strikeout.
He returned to the Senators' farm system in 1962 and toiled there for five more seasons without returning to the majors.