Synopsis Hindutva: Who is a Hindu? is a 1923 ideological pamphlet by Vinayak Damodar Savarkar. The text exhibits one of the early uses of the term Hindutva (a Sanskrit -tva, a neuter abstract suffix, meaning "Hinduness", "quality of being a Hindu"). It is one of the foundational texts of contemporary Hindu nationalism.

Savarkar wrote the pamphlet while imprisoned in Ratnagiri jail. It was smuggled out of the prison and was published by Savarkar's supporters under his alias "Mahratta."

An atheist, Savarkar regards Hinduism as an ethnic, cultural and political identity. Hindus, according to Savarkar, are patriotic inhabitants of Bharatavarsha, those who consider India (Bharat) to be their fatherland (pitrbhumi) as well as their "holyland" (punyabhumi). Sarvakar includes all Dharmic religions in the term "Hindusim" and outlines his vision of a "Hindu Rashtra" (Hindu Nation) as "Akhand Bharat" (United India), stretching across the entire Indian subcontinent.