Fides or FIDES may refer to:
- Faith, trust, loyalty, or fidelity, or a religious belief
- Fides (cycling team), an Italian professional cycling team in 1961
- Fides (deity), goddess of trust in Roman mythology
- Fides (reliability), guide allowing estimated reliability calculation in electronics
- Fides (name), given name
- 37 Fides, asteroid in the main belt of Earth's Solar System
- Uberrima fides, legal doctrine governing insurance contracts
- Agenzia Fides, news agency of the Vatican
- FIDES Bank Namibia, a commercial bank
- Fonds d'Investissements pour le Developpement Economique et Social, former government agency of colonial-era France
- Sky Fides, a Czech paraglider design