In ancient Roman religion, Ops or Opis (Latin: "Plenty") was a fertility deity and earth goddess of Sabine origin. According to Roman tradition, the cult of Opis was instituted by Titus Tatius, one of the Sabine kings of Rome. Opis became the patroness of riches, abundance, and prosperity, with a temple in the Capitolium. Festivals were held in her honor.

Opis was the wife of Saturn, and also his sister and the daughter of Caelus. Her children were Jupiter, Neptune, Pluto, Juno, Ceres, and Vesta. When Saturn learned of a prophecy that his and Opis' children would overthrow him as leader, he ate his children one by one after they were born. Opis, being the loving mother that she was, could not just stand by and let the last of her children be eaten by her husband. So, she wrapped a rock in swaddling clothes, and fed that to Saturn instead of Jupiter. Opis then went on to raise Jupiter, and then helped him free his siblings from their father's stomach.