Nadar may refer to:
- Nadar (caste), a prominent Tamil caste of India and in the Tamil diaspora
- Nadar (photographer), the pseudonym of 19th-century French photographer and caricaturist Gaspard-Félix Tournachon
- Prix Nadar, an annual award for a photography book edited in France, named for pioneering French photographer Félix Nadar
- Nădar, a village in Spinuș Commune, Bihor County, Romania