Nastik may refer to:

• Nastika, Indian philosophical schools and persons that do not accept the authority of the Vedas as supreme; the word is often translated as "atheist". It also refers to a person who do not believe in God and those who antagonize religion and God; and the work which is carried out in the name of God.
• Nastik (1954 film), a 1954 Bollywood film by I. S. Johar starring Nalini Jaywant and Ajit
• Nastik (1983 film), a 1983 Bollywood film by Pramod Chakravorthy
• Nastik (2018 film), a 2018 Bollywood film by Shailesh Varma starring Arjun Rampal and Harshaali Malhotra

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