Juan Guillermo Martínez Huertas (born 21 November 2004) is a Colombian road racing cyclist who currently rides for UCI WorldTeam Team Picnic PostNL .
[2] From Úmbita in Colombia, he trained in the Boyacá Race of Champions Program and rode with Team Tibaná in 2022.
In that year, he was the runner-up of the Vuelta del Porvenir, won the Clásica de Anapoima and the Clásica de Aguazul.
[4][5] With Q36.5 he won the Bassano-Monte Grappa and finished 6th overall at the Giro della Valle d'Aosta.
He was signed for the 2025 season by for UCI WorldTeam Team Picnic PostNL.