Maharaja Sher Singh (4 December 1807 - 15 September 1843) was a Sikh ruler of the sovereign country of Punjab and the Sikh Empire. He was the son of Maharaja Ranjit Singh and Maharani Mehtab Kaur, who was also the mother of Prince Tara Singh (1807-1859). (Mehtab Kaur, who was also known as Mahitab Kaur, is not to be confused with Maharani Mahtab Devi Sahiba, daughter of Maharaja Sansar Chand of Kangra, another wife, who committed sati in 1839 with Ranjit Singh lying with his head on her lap.)