Frank Stephen Krenn (July 30, 1911^[1] – after 1965) was a civil servant, journalist and political figure in Saskatchewan. He represented Watrous from 1938 to 1944 in the Legislative Assembly of Saskatchewan as a Liberal.

He was born in Wilmont, Saskatchewan, the son of Joseph Krenn and Mary Winkels, both of German descent, and was educated at St. Peter's College.^[1] His parents had both died when he was seven.^[2] In 1937, Krenn married Sybilus Smith. He lived in Bruno, Saskatchewan.^[1] Krenn resigned from a civil service job to seek the Liberal candidacy for Watrous in 1938.^[2] He ran unsuccessfully for a seat in the Canadian House of Commons in a 1943 by-election held in the Humboldt riding.^[3] Krenn was defeated by James Andrew Darling when he ran for reelection to the Saskatchewan assembly in 1944.^[4] He later ran as an independent in the British Columbia riding of Fraser Valley in the 1965 Canadian Election, receiving 272 votes.^[5]