Thomas O'Brien

There have been multiple persons named Tom O'Brien or Thomas O'Brien in baseball history.

• Tom O'Brien (o'brito01) - Thomas H. O'Brien, major league player from 1882-1890
• Tom O'Brien (o'brito02) - Thomas J. O'Brien, major league player from 1897-1900

• Tommy O'Brien - Thomas Edward O'Brien, major league player from 1943-1950

• Buck O'Brien - Thomas Joseph O'Brien, major league player from 1911-1913

• Thomas O'Brien (minors01) - Thomas P. O'Brien, minor league player from 1890-1893
• Thomas O'Brien (minors02) - Thomas O'Brien, minor league player in 1895
• Thomas O'Brien (minors03) - Thomas O'Brien, minor league player in 1901
• Thomas O'Brien (minors04) - Thomas F. O'Brien, minor league player from 1903-1904
• Thomas O'Brien (minors05) - Thomas James O'Brien, minor league player from 1905-1916
• Thomas O'Brien (minors06) - Thomas J. O'Brien, minor league player in 1906
• Thomas O'Brien (minors07) - Thomas J. O'Brien, minor league player in 1940
• Thomas O'Brien (minors08) - Thomas Michael O'Brien, minor league player from 1955-1957
• Thomas O'Brien (minors09) - Thomas Michael O'Brien, minor league player from 1970-1971

• Thomas O'Brien (manager) - Thomas J. O'Brien, minor league manager in 1892

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