Dennis Thomas Flynn (February 13, 1861 – June 19, 1939) was an American politician and a Delegate from Oklahoma Territory to the United States House of Representatives.

In 1889 Flynn was appointed by President Harrison Postmaster of the City of Gutherie, Oklahoma, and the family moved to that place.

Flynn then moved to Oklahoma Territory where he served as the postmaster of Guthrie from April 4, 1889, to December 20, 1892.

A Republican, he was an unsuccessful candidate for election as the Territorial Delegate to the United States House of Representatives in 1890.

[2] He ran again and was elected as the Territorial Delegate to the Fifty-third Congress and began his term on March 4, 1893 and was reelected in 1894.