James Manahan (March 12, 1866 – January 8, 1932) was a U.S. representative from Minnesota.

Manahan was born near Chatfield in Fillmore County, Minnesota, to Irish immigrant parents. He graduated from the Normal School of Winona, Minnesota, in 1886. For two years, he worked as a school teacher in Graceville. He later attended the University of Wisconsin Law School, and eventually earned his law degree from the University of Minnesota Law School in 1889. Having been admitted to the bar the same year, he began practicing law in St. Paul, later relocating his practice to Lincoln, Nebraska, in 1895. He moved back to Minneapolis in 1905, and practiced law there until 1912, when he was elected as a Republican to the Sixty-third Congress (March 4, 1913 – March 3, 1915). He declined to be a candidate for renomination in 1914, and resumed his law practice. He became involved with the Nonpartisan League and served as a legal advisor. He died in St. Paul in 1932.

 This article incorporates public domain material from Biographical Directory of the United States Congress. Federal government of the United States.