Rao
- Cramér–Rao bound
- Krypton (comics)
- Leite Lopes Airport
- List of Greyhawk deities
- Rai (disambiguation)
- Ramji Rao Speaking
- Rao (Chinese surname)
- Rao (Indian surname)
- Rao (title)
- Rao (wasp)
- Rao Arrondissement
- Rao Prefecture
- Rao language
- Rao's
- Rao, Senegal
- Rao, West Sumatra
- Raoh
- Rao–Blackwell theorem
- Rau (disambiguation)
- Rawa people
- Ray (disambiguation)
- Recent African origin of modern humans
- Recurrent airway obstruction
- Response amplitude operator
- Ribose aminooxazoline
- Råö