Kallachirippu (transl. Fake smile) is a 2018 Indian Tamil language streaming television series. It has a non-linear narrative structure provided and is hosted by Zee5, a video on demand platform. The series was directed by Rohit Nandakumar and produced by popular film director Karthik Subbaraj under his own production company Stone Bench Productions. This was Karthik Subbaraj's first series as a producer and it was the first series for Stone Bench Productions company. The series was released on the streaming platform Zee5 on 23 July 2018 and eventually ended up on 30 July 2018 with only 8 episodes.

It starred Amrutha Srinivasan in the lead role while Vikas, Vignesh Shanmugam, Rajalakshmi, Uma, Maheshwaran and Nandakumar played pivotal roles. This web series is also the second series to be launched by Zee5 network after America Mappillai. The series received positive reviews from critics and audience for portrayal of women in more prominent identical roles than the male counterparts. The theme of series consists of lust, sexuality, pornography, LGBT, abortion and extramarital affairs apart from love and arranged marriage. The series was released as a film in 2023.