Additional Special Judge Suvarna Kevale held Jitendra Babulal Shinde, Santosh Gorakh Bhawal and Nitin Gopinath Bhailume guilty of rape, murder and criminal conspiracy.
The quantum of punishment is likely to be pronounced on November 22.
The incident had triggered widespread protests from the Maratha community with marches being held across the state.
The victim, who belonged to the Maratha community, was found murdered after being raped on July 13 at Kopardi village in Ahmednagar district.
The accused had inflicted injuries all over her body and broken her limbs before throttling her, police said.