Kharak Singh (22 February 1801 – 5 November 1840) was the second Maharaja of the Sikh Empire. He was the eldest son of Maharaja Ranjit Singh, founder of the Sikh Empire and his consort, Maharani Datar Kaur. He succeeded his father on 27 June 1839 and reigned until his dethronement and imprisonment on 8 October 1839. He was succeeded by his only son Nau Nihal Singh.

His mother, Datar Kaur Nakai (the second wife of Ranjit Singh), was the daughter of Ran Singh Nakai, third ruler of the Nakai Misl. The prince was named by his father "Kharak" (ਖਰਕ) which means 'Wielder of the Sword'; he was named after the unconquerable warrior mentioned in Dasam Granth. According to Gyani Sher Singh, Ranjit Singh knew the entire Dasam Granth by heart. It was his birth that persuaded his father to proclaim himself the Maharaja of Punjab.