Pinus arunachalensis^[1][2] is a species of large-sized^{[citation needed]} conifer in the family Pinaceae.^[1]

It is native to the Arunachal Pradesh state of northeastern India,^[2] specifically near the towns or districts of Tawang and West Kameng in the eastern Himalayan Mountains, from which Pinus ravii is also found.^{[citation needed]} The species range is located within a temperate climate.^[2] It has a smaller structure and size than Pinus wallichiana, but is larger than Pinus ravii.^{[citation needed]}

The Latin epithet "arunachalensis" in Pinus arunachalensis was named for the state of Arunachal Pradesh, India.^{[citation needed]}

It was originally listed under the now regarded synonym: Pinus parva (Pinus wallichiana var. parva), but the same scientific name was already taken for a fossil pine species, hence it was renamed and revised as such.^[2]