Buyeo or Puyŏ (Korean: 부여; Hanja: 夫餘 Korean pronunciation: [pu.jʌ]) was an ancient kingdom located in parts of southern Manchuria (Northeast China) and northern Korea, from around the 2nd century BC to 494. Its remnants were absorbed by the neighboring kingdom of Goguryeo in 494. Both Goguryeo and Baekje, two of the Three Kingdoms of Korea, considered themselves its successor nation.

Although records are sparse and contradictory, it is speculated that in 86 BC, Dongbuyeo (Eastern Buyeo) branched out, after which the original Buyeo is sometimes referred to as Bukbuyeo (Northern Buyeo). Jolbon Buyeo was a small tribal state situated in north of the Korean peninsula and Manchuria. According to Samguk Sagi, in 504, the tribute emissary Yesilbu mentions that the gold of Buyeo can no longer be obtainable for tribute as Buyeo has been driven out by the Malgal and the Somna and absorbed into Baekje. It is also shown that the Emperor Xuanwu of Northern Wei wished that Buyeo would regain its former glory. In 538, long after the fall of Buyeo, Baekje renamed itself Nambuyeo (Southern Buyeo).

"Buyeo" may also refer to a Baekje surname or Buyeo County in South Korea.

The founder of the Buyeo kingdom was probably Dongmyeong, having no relations with Jumong who founded Goguryeo. After its foundation, Hae Mo-su (解慕漱：the son of heaven) brought the royal court to his new palace, and they proclaimed him King. Hae Mo-su called his new kingdom "Buyeo" to show that he was the true successor to the Kings of Buyeo. Generally, this Buyeo is often known as "Bukbuyeo" (Northern Buyeo).

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