The court held them guilty of 13 offences including gangrape, unnatural offence, murder, dacoity, conspiracy, kidnapping and destruction of evidence. It convicted the four by relying on the victim's dying declaration and forensic evidence.
The court will hear tomorrow the arguments on quantum of sentence.
The verdict in the incident, which had evoked nationwide outrage and consequent amendments to the anti-rape laws, followed a trial which was concluded in 130 hearings and was extensively covered by the media.
The decision came almost ten days after the juvenile accomplice was sentenced to three-year term at a detention centre after being held guilty by the Juvenile Justice Board of gangrape and murder of the paramedic and robbing a carpenter before the incident of gangrape in the same bus.
The trial in the robbery case against the four is progressing in another court.
Additional Sessions Judge Yogesh Khanna had on September 3 reserved his order for today after the prosecution and the accused concluded their arguments.
During the trial, accused Mukesh admitted his presence in the bus, three accused - Vinay Sharma, Akshay Thakur and Pawan Gupta - denied the charges levelled against them while prime accused and bus driver Ram Singh was found dead in his cell in Tihar jail on March 11, merely over a month since the beginning of the proceedings.
Special Public Prosecutor Dayan Krishnan had, however, junked accused claims and pressed the prosecution version that the accused were on the road on December 16 night in pursuance of a plan and targeted the victims, including the girl, in their "quest for sexual satisfaction and loot", committing a crime which was "grotesque to say the least".
(With PTI inputs)