Foldy or Földy is a surname. Notable people with the surname include:
László Földy (1934–2015) Hungarian and Swiss international table tennis player Leslie Lawrance Foldy (1919–2001), theoretical physicist Peter Foldy (), Hungarian-born recording artist, film producer, director and screenwriter
Fictional characters Foldy, a character from the fourth season of Battle for Dream Island, an animated web series
See also Földi Foldy–Wouthuysen transformation