Denis Cregan (born 4 May 1940) is an Irish publican and former Fine Gael party politician from Cork, who served for 17 years as a senator. A former branch vice-president of the Irish Transport and General Workers' Union, Cregan was a long-standing member of Cork City Council from 1979 to 2009, and was Lord Mayor of Cork from 1991 to 1992. He had unsuccessfully contested the Cork South-Central constituency at the 1981 and February 1982 general elections. He stood in the 1982 Seanad elections, winning a seat on the Labour Panel, which he held until his defeat in the 1989 elections to the 19th Seanad Éireann.