Guy Judah (born c. 1986), known by his stage name Guy J, is an Israeli progressive house, techno and electro music producer and DJ who has released three albums and over 15 EPs since 2008. His recordings are noted for their diverse and wide range of musical styles, while his DJ work is known for creating immersive "journey-like" live shows.
In July 2012, he founded the imprint record label Lost & Found, supported by the British DJ and producer John Digweed. Lost & Found serves as a vehicle both for his own work, and for producers he admires, including Sahar Z, Nick Muir, Roy Rosenfeld and Jamie Stevens.
Born in Tel Aviv, as of 2020 he is based in Gozo in Malta.