Arjuna or Terminalia arjuna is a tree of the genus Terminalia. It is commonly known as Hole Matthi in Kannada.

The arjuna grows to about 20–25 metres tall; usually has a buttressed trunk, and forms a wide canopy at the crown, from which branches drop downwards. It has oblong, conical leaves which are green on the top and brown below; smooth, grey bark; it has pale yellow flowers which appear between March and June; its glabrous, 2.5 to 5 cm fibrous woody fruit, divided into five wings, appears between September and November.

The arjuna is usually found growing on river banks or near dry river beds in Sri Lanka, Bangladesh, Uttar Pradesh, Madhya Pradesh, West Bengal and south and central India. The arjuna is one of the species whose leaves are fed on by the Antheraea paphia moth which produces the tassar silk, a wild silk of commercial importance.

The arjuna was introduced into siddha by saint Agastiyar through his prose Gunavakatam and in Ayurveda as a treatment for heart disease by Vagbhata (c. 7th century CE). It is traditionally prepared as a milk decoction. In the Ashtānga Hridayam, but was also mentioned in many ancient Hindu vedas, and was a known practice for thousands of years, passed down by tradition, before vagbhata mentioned it in his writings. Vagbhata mentions arjuna in the treatment of wounds, hemorrhages and ulcers, applied topically as a powder. The Arjuna plant (lat. Terminalia arjuna) has traditionally been used to treat heart disease for centuries, which is why it got the nickname “Guardian of the heart.”

The hero of the famous epic “Mahabharata”, was named after this tree because of its protective effects.