John Albert Rowan (June 16, 1886 – September 29, 1966) was a Major League Baseball pitcher.

He pitched all or part of seven seasons in the majors, between 1906 and 1914, for four teams.

When he wasn't pitching in the majors, Rowan played for the Dayton Veterans of the Central League in 1908 and from 1912 until 1917.

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