Guy Niv (Hebrew: גיא ניב; born 8 March 1994 in Misgav) is an Israeli former cyclist, who competed as a professional for UCI WorldTeam Israel–Premier Tech from 2018 to 2022. In 2019, he completed the Giro d'Italia, finishing in 113th place. In August 2020, he became the first Israeli national to race in the Tour de France.

In September 2022, he announced his retirement from the sport, citing a loss of motivation and desire to compete.