Gerald Ryan Ottenheimer QC (June 4, 1934 – January 18, 1998) was a Canadian politician and Senator.
Ottenheimer ran unsuccessfully as a Progressive Conservative in the 1965 federal election in the Newfoundland and Labrador riding of St. John's West.
In 1987, he was appointed to the Senate by Brian Mulroney representing the senatorial division of Waterford-Trinity, Newfoundland.
He was married to Alma and had four daughters, Geraldine, Suzanne, Bernadette and Ann Marie.
His half-brother is former MHA John Ottenheimer and he was the father-in-law of former Progressive Conservative Party leader Ed Byrne.