- NotusGod of the south or southwest wind, son of Eos and Astraeus.
- noto-south, southern
- notornisThe takahe, Porphyrio mantelli, a flightless rail native to New Zealand.
- notoungulateAny of several extinct, hoofed, herbivorous mammals of the order †Notoungulata, from Cenozoic South America.