Legionnaires may refer to:
- Spanish Legion
- French Foreign Legion
- Legionnaires' Movement in Romania, see: Iron Guard
- Legionnaires' disease
- Legion of Christ
- Charlemagne's Legionnaires
- Legion of Super-Heroes
- Legionnaire (1998 film)
- members of The American Legion
- A Legionnaires hat - a caped baseball cap that protects the neck and ears from the sun, inspired by the caped kepi worn by the French Foreign Legion.