Seif al-Islam Kadhafi, Saadi Kadhafi and former spy chief Abdullah Senussi are among more than 30 officials from the ousted regime who are to stand trial on charges ranging from murder to embezzlement.
Former premiers Al-Baghdadi al-Mahmudi and Bouzid Dorda are also among those going on trial from April 14, Seddik al-Sour, spokesman for the state prosecutor's office, told a news conference.
Charges against Kadhafi's sons and aides include murder, kidnapping, complicity in incitement to rape, plunder, sabotage, embezzlement of public funds and acts harmful to national unity.
His older brother Seif al-Islam, Kadhafi's former heir apparent, is being held by rebels in the western city of Zintan who have refused to transfer him to Tripoli for the trial.
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Sour said the trial date was set at a hearing today that was "open to the public", although the media were not informed in advance.
According to state news agency Lana, 23 out of 37 defendants were present, including Senussi and Mahmudi.
They were charged last October.
In February, Human Rights Watch said Seif al-Islam and Senussi had complained of having had no legal representation during interrogation and pre-trial hearings.