Naina Singh, also known as Narayan Singh, was a Nihang warrior and fifth Jathedar of Budha Dal and a chief of the Shaheedan Misl during the late 18th century.

The Nihang or Akali, also known as Dal Khalsa, is an armed Sikh warrior order originating in the Indian subcontinent. Nihangs are believed to have originated either from Fateh Singh and the attire he wore or from the "Akal Sena" started by Guru Hargobind. Early Sikh military history was dominated by the Nihang, known for their victories where they were heavily outnumbered. Traditionally known for their bravery and ruthlessness in the battlefield, the Nihang once formed the irregular guerrilla squads of the armed forces of the Sikh Empire, the Sikh Khalsa Army.