The Arjun (Sanskrit: अर्जुन) is a third generation main battle tank developed by India's Defence Research and Development Organization (DRDO), for the Indian Army. The tank is named for Arjun, a character in the Indian epic, Mahabharata.

The Arjun features a 120 mm main rifled gun with indigenously developed APFSDS ammunition, one 7.62 mm coaxial machine gun, and a 12.7 mm machine gun. It is powered by a single MTU multi-fuel diesel engine rated at 1,400 hp, and can achieve a maximum speed of 70 km/h (43 mph) and a cross-country speed of 40 km/h (25 mph). It has a four-man crew: commander, gunner, loader and driver. Automatic fire detection and suppression, and NBC protection systems are included. All-round anti-tank warhead protection by the newly developed Kanchan armour is claimed to be much higher than available in comparable third generation tanks.

In March 2010, the Arjun was pitted against the T-90 in comparative trials and performed well. Subsequently delays and other problems in its development from the 1990s to the 2000s prompted the Indian Army to order vast numbers of T-90S tanks from Russia to meet requirements that the Arjun had been expected to fulfill.

Arjun (pronounced [ɐrˈɟun]) is a first name of a male, based on Arjuna, a legendary hero who is considered as the greatest archer ever and a central character in the Hindu epic Mahabharata.

It also refers to: Kartavirya Arjuna, a king killed by Parshurama.

MBT may refer to: