Peter Maher (born 16 March 1869, in Gunnode, Tuam, County Galway, Ireland – 22 July 1940 in Baltimore, Maryland) was an Irish boxer known for his powerful punch.

Early in his career Maher won the 1888 Middleweight Championship of Ireland, and the 1890 Heavyweight Championship of Ireland.

After moving to the United States, he claimed the Heavyweight Championship of the World in 1895 by knocking out Steve O'Donnell in the first round.

In 1896 Bob Fitzsimmons, defeated Maher in a fight in Coahuila de Zaragoza, Mexico, taking his disputed heavyweight title claims.

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