| Honorific-Prefix: | Sri Sri Rai Rajeshwar |
| Raya Budhhi Karna Khebang | |
| Predecessor: | Kama Datta Sen |
| Successor: | abolished |
| Office2: | Subba of Limbuwan |
| Successor2: | abolished |
Buddhi Karna Raya (Nepali : बुद्धिकर्ण राया ) was the last Limbu overlord king of Limbuwan. He was killed by the forces of Gorkhali king Prithvi Narayan Shah in AD 1774. The Limbuwan lands where he was king or overlord king were between Saptakoshi River to Kankai River covering present day three districts: Sunsari, Morang and parts of Jhapa. After Buddhi Karna's death the later kings in Limbuwan acknowledged the overlordship of the Gurkha King. It was about the time of Buddhi Karna's death that the Gorkha Kingdom was transformed into Nepal. His death was connected with the Limbuwan–Gorkha war.
After the assassination of Kama Datta Sen, Buddhi Karna came to Bijaypur and became the last Limbu king (Rai) of Morang and Subba of Limbuwan. On hearing of the death of King Kama Datta Sen, all the states that made up Limbuwan and their allies split up. The kings of Limbuwan no longer had allegiance to Buddhi Karna. He needed able ministers and chiefs to assist him in ruling Morang and all of Limbuwan. He sent people to look for King (Hang) Shamo Hang Chemjong of Miklung Bodhey Kingdom to help him.
He was tricked into coming to Bijaypur- (Limbuwan) present day Dharan for a negotiation, then killed by the agents of Gorkha Kingdom King Prithvi Narayan Shah in AD 1773, Budhhi Karna Khebang's soul is believed to have wandered around the area of his tomb (Budha Subba Temple) around Bijaypur and was said to be a friendly and helpful spirit. Then local Limbu people started worshiping the soul as an old Limbu king (Hang) believing it to bring good luck. In Limbu language Hang means King.