Fides may refer to:
- Fides (mythology), goddess of trust in Roman mythology
- Fides (reliability), guide allowing estimated reliability calculation in electronics
- Fides Romanin, Italian cross-country skier of the 1950s
- 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
As an acronym or abbreviation, FIDES may refer to:
- Fonds d'Investissements pour le Developpement Economique et Social, former government agency of colonial-era France
- Fondo Intergubernamental para la Descentralización, government agency of Venezuela
- Fishery Data Exchange System, European Commission database for EU member fishery data