Denis O'Donovan (born 23 July 1955) is an Irish Fianna Fáil politician who served as a Senator for the Agricultural Panel from April 2011 to January 2025.

He served as a Teachta Dála (TD) for the Cork South-West constituency from 2002 to 2007.

He has a degree in law from University College Cork and is a qualified solicitor.

[1] In June 2010, he lost the Fianna Fáil parliamentary party whip when he failed to support the government on the Dog Breeding Establishment bill.

He is the Fianna Fáil Seanad spokesperson on Marine and Fisheries.