William Cullen (March 4, 1826 – January 17, 1914) was a U.S. Representative from Illinois.

Born in County Donegal, Ireland, Cullen immigrated to the United States in 1832 with his parents, who settled in Pittsburgh, Pennsylvania, where he attended the public schools and the Allegheny Academy.

He later relocated to Adams Township, LaSalle County, Illinois, in 1846 and engaged in agricultural pursuits.

He lived in retirement in Ottawa, Illinois, until his death there January 17, 1914.

[citation needed] This article incorporates public domain material from the Biographical Directory of the United States Congress