James Charles Kerwin (May 14, 1850 – January 29, 1921) was an American lawyer and judge from Wisconsin.

He was a justice of the Wisconsin Supreme Court for the last 16 years of his life (1905–1921).

[1] He was elected city attorney of Neenah, and served in that role for 12 years and was appointed to the University of Wisconsin Board of Regents in 1901 by Governor Robert M. La Follette.

[1] In 1904, he was elected to the Wisconsin Supreme Court, taking office in January 1905.

Jim Sensenbrenner, who represented Wisconsin for 42 years in the United States House of Representatives is the great-grandson of Justice Kerwin through his daughter, Grace, who married John Stilp Sensenbrenner of Neenah.