Additional Sessions Judge Ashutosh Kumar let off West Delhi residents Lokesh, Arun and Kuldeep of the penal charges as neither the girl nor the medical report confirmed the rape.
The girl had not identified the accused either as persons who had allegedly kidnapped her, the court said.
"Neither acts (kidnapping and rape) alleged nor the identity of the accused persons as the ones who had committed the offences, nor the offence of kidnapping or gang rape etc has been proved from the testimony of the witnesses.
"Even, the medico-legal Case of the girl does not show that any rape was committed on her, as admittedly no semen was found and there was no injury on the private parts of the prosecutrix," the judge said.
According to the prosecution, the girl was allegedly kidnapped by the accused on November 11, 2011, when she was returning home from her school.
According to her complaint, the accused had taken her to a secluded spot in a car and took turns to rape her.
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She had alleged that they threatened to kill her mother and father and asked her to keep quiet about the incident.
During the trial, the girl deposed contradictory to her complaint and statement to the police, denying that she was raped.