Byeon, also known as Byun, Pyon (변) is a Korean surname. Notable people with the surname include:
- Byeon Chang-heum (born 1964), South Korean educator and politician
- Byeon Hyo-mun (1396–?), Joseon diplomat
- Byeon Jin-su (born 1993), South Korean baseball player
- Byeon Jun-byum (born 1991), South Korean football player
- Byeon Sang-byeok, Joseon painter
- Byeon Sang-su (born 1964), South Korean canoeist
- Byeon Sung-wan (born 1965), South Korean politician
- Byeon Woo-seok (born 1991), South Korean actor
- Byeon Yeong-ro (1898–1961), South Korean poet
- Pyon Yong-tae (1892–1969), South Korean politician
- Baekhyun (born Byun Baek-hyun, 1992), South Korean singer and actor, member of boy band Exo
- Byun Byung-joo (born 1961), South Korean football player
- Byun Chun-sa (born 1987), South Korean short track speed skater
- JJu (born Byun Eun-jong), South Korean retired StarCraft pro gamer and poker player
- Byun Hee-bong (1942–2023), South Korean actor
- Byun Ho-young (born 1945), South Korean football player
- Byun Hye-young (born 1983), South Korean former swimmer
- Byun Jae-sub (born 1975), South Korean footballer
- Byun Jang-ho (1940–2022), South Korean film director
- Byun Ji-hyun (born 1999), South Korean figure skater
- Byun Jung-il (born 1968), South Korean retired boxer
- Byun Jung-soo (born 1974), South Korean model and actress
- Byun Se-jong (born 1998), South Korean figure skater
- Byun Sung-hwan (born 1979), South Korean retired footballer
- Byun Woong (born 1986), South Korean footballer
- Byun Yo-han (born 1986), South Korean actor
- Byun Young-joo (born 1966), South Korean film director
- Byun Young-joon (born 1984), South Korean racewalker
- Pyon In-son (born 1946), North Korean politician
- Pyon Kwang-sun (born 1986), North Korean artistic gymnast
- Pyon Rye-yong (born 2001), North Korean artistic gymnast
- Pyon Yong-rip (1929–2016), North Korean politician