Dennis D. Donovan (January 31, 1859 – April 21, 1941) was a 19th-century American lawyer, educator, businessman, and politician who was a U.S. Representative from Ohio for two terms, from 1891 to 1895.

He was admitted to the bar the same year and commenced practice in Deshler, Ohio.

He was appointed postmaster of Deshler by President Cleveland on July 21, 1885, and served until January 27, 1888.

He moved to Napoleon, Ohio, in 1897 and continued the practice of law.

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