36 Days also known as 36 Days: Secrets are injurious to health is an Indian Hindi-language crime-thriller streaming television series created for SonyLIV, by Vishal Furia and produced by Applause Entertainment and BBC Studios. The series features Neha Sharma, Purab Kohli, Chandan Roy Sanyal, Sharib Hashmi, Chahat Vig, Amruta Khanvilkar, Shruti Seth and Sushant Divgikar in the pivotal roles. Set in a serene suburban housing estate in Goa, this Indian thriller, an official adaptation by Anahata Menon of the British series 35 Days, explores a story of deceit, love, and suspense. When a mysterious woman arrives, she disrupts the neighborhood, leading to unexpected events, including a shocking murder, which intertwines the lives of the residents in a tale of mystery and suspense.

The series was officially announced by the streaming network in April 2023. Principal photography primarily took place in Goa, with key scenes shot in Vasco Da Gama and a few scenes shot in Mumbai.

36 Days premiered on 12 July 2024, to a positive response from audiences, although critics offered mixed reviews. The performances received praise, but the screenplay and predictability were criticized.