Sartaj Singh is a fictional character from the Indian web series Sacred Games, which is based on the novel of the same name by Vikram Chandra. He is portrayed by actor Saif Ali Khan and serves as a police officer in Mumbai. The series follows his journey as he uncovers a complex web of crime, politics, and spirituality. In Sacred Games, Sartaj grapples with personal and professional challenges while trying to stop a looming threat to the city. His character is marked by a sense of moral ambiguity and a quest for redemption, making him a compelling figure in the narrative.