Peter James O'Brien (June 16, 1867 – June 30, 1937) was a Major League Baseball player. He played in one game for the Washington Nationals in 1887 and 27 games for the Chicago Colts in 1890. Sources Retrosheet page for Pete O'Brien 1867 births 1937 deaths 19th-century baseball players Baseball players from Illinois Chicago Colts players Major League Baseball second basemen St. Paul Apostles players Washington Nationals (1886–1889) players Chicago Whitings players