William Henry Hinrichsen (May 27, 1850 – December 18, 1907) was a U.S. Representative from Illinois. Hinrichsen was Sheriff of Morgan County from 1880 to 1882. He afterwards turned to publishing interests, owning the Illinois Courier and Quincy Herald. Hinrichsen became involved with the Democratic Party in 1888, eventually rising to the position of Secretary of State of Illinois in 1892. During his term, he was elected Chairman of the state Democratic Committee. He was then elected to the United States House of Representatives and served one term. He briefly edited the Cincinnati Enquirer and spent the rest of his life writing.