Pandurang Sadashiv Sane (Marathi: पांडुरंग सदाशिव साने; Marathi pronunciation: [paɳɖurəŋɡə səd̪aʃiwə sane]; 24 December 1899 – 11 June 1950), also known as Sane Guruji (Guruji meaning "respected teacher") by his students and followers, was a Marathi author, teacher, social activist and freedom fighter from Maharashtra, India. He is referred to as the National Teacher of India.

Guruji wrote around 135 books and about 73 books have been published and almost all these books can be considered [19] literature for children. His most well-known work in Marathi literature include Śyāmacī Āi (Marathi: श्यामची आई; Shyam's Mother), Śyāma (Marathi: श्याम) which has been translated in almost all the Indian languages as well as in Japanese and English. The others include Bhāratiya Saṃskṛti (Marathi: भारतीय संस्कृति; Indian Culture) and Patri- the collection of various songs and poems.

One of his books, "Teen Muley", is a heart warming story of a group three children and is considered classic and one of the best books written in Marathi.

He started a weekly journal named Sadhana (weekly) on 15 August 1948. This journal has been regularly published since then.