Rasmussen is a surname of Danish and Norwegian origin. It may also refer to:

• Rasmussen, Queensland, a suburb in the City of Townsville, Queensland, Australia
• Rasmussen Basin, a natural waterway through the Canadian Arctic Archipelago in the territory of Nunavut
• Rasmussen Lowlands, a 3,000 km² coastal plain complex of wetlands in Nunavut, Canada
• Knud Rasmussen Glacier in the far northwest of Greenland, to the north of the Thule Air Base

• Murder of Sherri Rasmussen

• Rasmussen's aneurysm, a pulmonary artery aneurysm adjacent or within a tuberculous cavity
• Rasmussen College, a private college offering degrees at multiple campuses in Minnesota
• Rasmussen's encephalitis, a rare, progressive neurological disorder
• Rasmussen Reports, an American public opinion polling company
• The "Rasmussen Report'", an informal name for the WASH-1400 report about nuclear reactor safety
• Knud Rasmussen-class patrol vessel, a class of offshore patrol vessel operating in the Royal Danish Navy from 2008

• Kall-Rasmussen Fragment, a parchment page (ca. 1275) from Saxo Gesta Danorum
• The Journals of Knud Rasmussen, a Canadian-Danish film about the pressures on the traditional Inuit culture when explorer Knud Rasmussen introduces European cultural influences