Ursus is Latin for bear. It may also refer to:

• Ursus (mammal), a genus of bears

• Ursus of Aosta, 6th-century evangelist
• Ursus of Auxerre, 6th-century bishop
• Ursus of Ravenna, 5th-century bishop
• Ursus of Solothurn, 3rd-century martyr
• Ursus (praefectus urbi) of Constantinople in 415-416
• Reimarus Ursus, an astronomer and imperial mathematician to Rudolf II
• Ursus, a pen-name of Ambrose Bierce

• Ursus, the bodyguard of Ligia, a minor character in the novel Quo Vadis
• Ursus, a character in Victor Hugo's novel The Man Who Laughs
• General Ursus (Planet of the Apes), a character in Beneath the Planet of the Apes
• Ursus (film character), a character in a series of 1960s Italian adventure films

• Ursus (film), 1961 Italian film

• Ursus (journal), a scientific journal published by the International Association for Bear Research and Management
• Ursus Factory, Polish manufacturer of heavy vehicles
  • Ursus A, a series of Polish lorries and buses from the 1920s
  • The Ursus, or Samochód pancerny wz. 29, a model of Polish armored car

• Ursus (beer), a Romanian beer
• Ursus (vodka), an Icelandic vodka
• Ursus, Warsaw, a borough of Warsaw, Poland

• Ursa (disambiguation)