Cullen may refer to:
- Cullen, Saskatchewan, a former hamlet in Benson No. 35 Rural Municipality
- Cullen, County Cork, a village near Millstreet, County Cork
- Cullen, Moray, a burgh in Moray
- United States
- Cullen, Kentucky
- Cullen, Louisiana, a town in Webster Parish
- Cullen, Virginia
- Cullen, Wisconsin, an unincorporated community in Oconto County
Art, entertainment, and media
- Cullen Bohannon, the protagonist of the Hell on Wheels (TV series)
- Cullen Rutherford, a recurring character in the Dragon Age series
- Cullen family of vampires, in the Twilight series by Stephenie Meyer
- Cullen (plant), a genus of legumes native to the Old World.
- Cullen College of Engineering, an academic college at the University of Houston
- Cullen number, a natural number of the form n · 2n + 1 (written Cn)
- Cullen skink, a thick Scottish soup
- Cullen Wines, a winery in Western Australia
- Cullen's sign, blue-black bruising of the area around the umbilicus
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