Tuanku Nan Tuo (c. 1723–1830) was a leading scholar and teacher of the Minangkabau ulama, based at Cangking in Ampek Angkek, Agam. He trained many prominent students, including Tuanku Imam Bonjol and Tuanku Nan Renceh, and championed a peaceful, gradualist approach to Islamic reform. During the Padri War his surau was attacked and burned by radical factions, marking him as a scholar-teacher rather than a combatant. His grave at Cangking is a site of visitation.