The incident took place yesterday when the tractor trolley hit the bike, in which the three were travelling, on Bhura-Pawti Kala road at Kairana police station area, they said.
The deceased have been identified as Ponin (26), Monu (23) and Sachin (22)of Jandheri village, police said.
The trolley driver escaped after the incident, they said, adding that the bodies have been sent for postmortem.