In Roman mythology, Fides ("trust") was the goddess of trust. Her Greek equivalent was Pistis. Her temple on the Capitol was where the Roman Senate kept state treaties with foreign countries, where Fides protected them. She was also worshipped under the name Fides Publica Populi Romani ("trust towards the Roman state"). She is represented by a young woman crowned with an olive branch, with a cup or turtle, or a military ensign in hand. She wears a white veil or stola; her priests wear white.

Rome's second king, Numa Pompilius instituted a yearly festival to Fides, and directed the priests to be borne to Her temple in an arched chariot drawn by two horses and should conduct Her services with their hands wrapped up to indicate protection.