| James William Nowlan | |
| Birth Date: | 4 November 1818 |
| Birth Place: | King's County, New Brunswick |
| Office: | MLA for King's County |
| Term: | 1873 to 1874 |
| Party: | Liberal Party of New Brunswick |
James William Nowlan (November 4, 1818 - March 26, 1900) was a political figure in New Brunswick, Canada. He represented King's County in the Legislative Assembly of New Brunswick from 1873 to 1874 as a Liberal member.
He was born in King's County, the son of James Nowlan, an Irish immigrant, and the former Miss Crawford. Nowlan was married at least three times, to Miriam Hayward, then Leah Gillis and later to Abigail Hayward, his first wife's sister. He was an unsuccessful candidate for a seat in the provincial assembly but was elected in an 1873 by-election held after George Otty was named to the bench. He died March 26, 1900.[1]