Bhai Aghar Singh (d. 1764) was, according to Giani Gian Singh, Panth Prakash, one of the seven sons of Bhai Nagahia, a Dullat Jatt of Laungoval, in present day Sangrur district of the Punjab. According to other sources, he was a Kamboj Sikh. He received amrit, the Khalsa rites of initiation, from his uncle Bhai Mani Singh, then Jathtedar of the Harmandar Sahib at Amritsar.
Along with his brother Tharaj Singh, he fought against the Mughals in Amritsar and avenged the execution of Bhai Mani Singh by slaying his tormentors. He also confronted and killed Mir Momin Khan of Kasur who. after the death in November 1753 of Mir Mannu, the governor of the Punjab, had launched a renewed campaign of persecution against the Sikhs.
Aghar Singh died in January 1764 at Sirhind Fighting against the provincial governor, Zain Khan.
1. Gian Singh, Giani, Panth Parkash. Patiala, 1970