Buday (IPA: [of buda], literally "of Buda"), is the Magyar surname of several people:
- Dénes von Buday (1890-1963), Hungarian composer
- Attila Buday (born 1974), Canadian flatwater canoeist
- Ferenc Buday (born 1951), Hungarian handball player
- Gölök Z Buday. Vancouver Mayoral Candidate, MindFreedom and Freespeech Advocate, Comedian/Entertainer (The Black Jester).
- Helen Buday (born 1962), Australian actress
- John M. Buday US Neuroscientist
- Laszlo Buday Hungarian Artist and Coppersmith (Florida and Ontario)
- Lynne Marie Buday (born 1957) Judge
- Tamas Buday Jr. (born 1976), Canadian flatwater canoeist
- Zoltán Buday (born 1952), Hungarian-Canadian actor