Arjuna (Devanagari: अर्जुन, Thai: อรชุน, Orachun, Tamil: Arjunan, Indonesian and Javanese: Harjuna, Harjuno, Herjuno, Malay: Ranjuna; pronounced [ɐrˈɟunɐ] in classical Sanskrit) in Indian history is the greatest warrior on earth and is one of the Pandavas, the heroes of the Hindu epic Mahābhārata. Arjuna, whose name means 'bright', 'shining', 'white' or 'silver' (cf. Latin argentum), was such a peerless superhuman archer that he is often referred to as Jishnu - the unbeatable and is compared with Achilles, Odysseus or Arash.

The third of the five Pandava brothers, Arjuna was the son of the king of gods, Indra, and Kunti, wife of king Pandu of Kuru. Arjuna was an ambidextrous master archer and as a Maharathi played a key role in the victory of Yudhisthira in the Mahabharata War. Taught by the master of military arts Drona, Arjuna used the magnificent bow Gāndeeva, and killed many Kaurava generals like Karna and Jayadratha. He was also a close friend of Krishna, an Avatar of god Vishnu. Arjuna had four wives, Subhadra, Draupadi, Chitrangada and Ulupi.

In the epic, Arjuna is said to have an amsha, or spiritual element, of sage Nara. Nara is the eternal companion of Narayana (identified with Vishnu), and sometimes considered one of the forms of Narayana. One of his most important roles was as the dear friend and brother-in-law of Lord Krishna, from whom he heard the Bhagavad Gita before the battle of Kurukshetra, and who acted as his charioteer during the battle. Arjuna is sometimes referred to as the 'fourth Krishna' of the Mahabharata.