| Ollie O'Mara | |
| Bats: | Right |
| Throws: | Right |
| Birth Date: | 8 March 1891 |
| Birth Place: | St. Louis, Missouri |
| Death Place: | Reno, Nevada |
| Debutleague: | MLB |
| Debutdate: | September 8 |
| Debutyear: | 1912 |
| Debutteam: | Detroit Tigers |
| Finalleague: | MLB |
| Finaldate: | April 19 |
| Finalyear: | 1919 |
| Finalteam: | Brooklyn Robins |
| Statleague: | MLB |
| Stat1label: | Batting average |
| Stat1value: | .231 |
| Stat2label: | Home runs |
| Stat2value: | 2 |
| Stat3label: | Runs batted in |
| Stat3value: | 77 |
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Oliver Edward O'Mara (March 8, 1891 in St. Louis, Missouri – October 24, 1989 in Reno, Nevada) was a shortstop in Major League Baseball from 1912 to 1919, primarily with the Brooklyn Robins. He had one at-bat in the 1916 World Series against the Boston Red Sox. He batted right and threw right, was tall and weighed 155 pounds.
O'Mara threw out the first pitch for the Los Angeles Dodgers on opening day in 1981. At the time of his death, he was the oldest living professional baseball player.[1] [2] He is buried in Kenosha, Wisconsin.