Iravan also known as Iravat and Iravant, is a minor character from the Hindu epic Mahabharata. The son of Pandava prince Arjuna (one of the main heroes of the Mahabharata) and the Naga princess Ulupi, Iravan is the central deity of the cult of Kuttantavar (Kuttandavar) which is also the name commonly given to him in that tradition—and plays a major role in the sect of Draupadi. Both these sects are of Tamil origin, from a region of the country where he is worshipped as a village deity and is known as Aravan. He is also a patron god of well-known transgender communities called Alis (also Aravani in Tamil, and Hijra throughout South Asia).

The Mahabharata portrays Iravan as dying a heroic death on the 8th day of the 18-day Kurukshetra War (Mahabharata war), the epic's main subject. However, the South Indian traditions have a supplementary practice of honouring Aravan's self-sacrifice to the goddess Kali to ensure her favour and the victory of the Pandavas in the war. The Kuttantavar tradition focuses on one of the three boons granted to Aravan by the god Krishna in honour of this self-sacrifice. Aravan requested that he be married before his death. Krishna satisfied this boon in his female form, Mohini. In Koovagam, Tamil Nadu, this incident is re-enacted in an 18-day festival, first by a ceremonial marriage of Aravan to Alis (hijra) and male villagers (who have taken vows to Aravan) and then by their widowhood after ritual re-enactment of Aravan's sacrifice.

The Draupadi tradition emphasises another boon: Krishna allows Aravan to witness the entire duration of the Mahabharata war through the eyes of his severed head. In another 18-day festival, the ceremonial head of Aravan is hoisted on a post to witness the ritual re-enactment of the Mahabharata war. The head of Aravan is a common motif in Draupadi temples. Often it is a portable wooden head; sometimes it even has its own shrine in the temple complex or is placed on the corners of temple roofs as a guardian against spirits. Aravan is worshipped in the form of his severed head and is believed to cure disease and induce pregnancy in childless women.

Iravan is also known in Indonesia (where his name is spelled Irawan). An independent set of traditions have developed around Irawan on the main island of Java where, for example, he loses his association with the Naga. Separate Javanese traditions present a dramatic marriage of Irawan to Titisari, daughter of Krishna, and a death resulting from a case of mistaken identity. These stories are told through the medium of traditional Javanese theatre (Wayang), especially in shadow-puppet plays known as Wayang Kulit.

According to the Monier Williams Sanskrit–English Dictionary (1899), the name Iravan (Sanskrit: इरावान्, Irāvān), also spelt Irawan, is formed from the root Iravat (इरावत्, Irāvat), also spelt Irawat. In turn, the root Iravat is derived from Irā (इरा)—closely linked with Iḍā (इडा)—meaning "possessing food", "endowed with provisions" or, by extension, "comfortable" (as used in the Mahabharata and the Rig and Atharva vedic scriptures). Alf Hiltebeitel, George Washington University professor of religion, suggests that the Sanskrit name Iravan or Iravant is derived from Iḍā-vant, "one who possessed Iḍā". The French Indologist Madeleine Biardeau describes religious use of the word Iḍā as reference to an "oblatory substance consumed by the participants from which comes all fecundity of the sacrifice". Based on this definition, Biardeau concludes that Iravant means sacrificial victim in the Mahabharata. Iḍā is also used elsewhere to denote a substance that Devas (gods) and Asuras (demons) vie for.

Iravan is generally known as Aravan (அரவான், Aravāṇ), also spelt as Aravaan in South India. He is revered as a deity in two southern Indian Hindu cults: the Kuttantavar cult (dedicated solely to Aravan), and the cult of Draupadi (Aravan's stepmother and Arjuna's wife). In his own cult, Aravan is also known as Kuttantavar (கூத்தாண்டவர்), originating from the legend of Kuttantavar killing the demon Kuttacuran. This name is sometimes spelled as Kuttandar, Khoothandavar or Koothandavar.

The South Indian, Tamil name, Aravan, is popularly believed to be derived from the word aravam (அரவம்) (snake). Aravan's association with snakes is also apparent in his iconography.

Aravan is always worshipped in temples in the form of his severed head. He is usually depicted with a moustache, pronounced eyes and large ears. Typically, he also wears a conical crown, a Vaishnava tilak mark on his forehead and earrings. Aravan is often depicted with a cobra hood over his crown, cobra heads sprouting through the crown, or a snake emerging from behind the crown. Even the chief Koovagam icon features a serpent on Aravan's crown asserting his mother Ulupi's naga lineage.