Raas may refer to:
- Renin-angiotensin-aldosterone system, a hormone system that helps regulate long-term blood pressure and blood volume in the body
- Runway Awareness and Advisory System, an airplane avionics system to improve flight crew situational awareness when operating at airports
- Dandiya Raas, a folk dance from the Indian state of Gujarat, often associated with Garba
- Rasa lila, a traditional Indian dance
- Región Autónoma del Atlántico Sur, a department in Nicaragua
- Raas (It. Rasa), a village in the municipality of Natz-Schabs (South Tyrol, Italy)
- Raas, a district of East Java