On Tuesday, a court in the country gave the ruling against Archbishop Philip Wilson of Adelaide.
Wilson's sentence will be announced in June and he will be sentenced to a maximum of two years, the BBC said.
Wilson is now the oldest Catholic in the world, who has been charged with such charges and who has been convicted of the trial.
Wilson has also been accused of telling the victims of sexual abuse to hide the facts. Although he denied the allegation in the hearing.
The charges against Wilson, in which he was secreted as a veteran pastor in New South Wales's Mitland, in 1970, has revealed that he is sexually harassed by the pastor James Fletcher.
Although Wilson had told the court last month, he did not know or could not remember anything about this.
But a person who was tortured during an Alter Boy in Mitland Church told the court that after Fletcher suffered sexual assault in 1976, he described Wilson as a detail.
Wilson claimed that he could not remember the conversation. The court dismisses Wilson's claim describing the tortured person as a credible witness.
Another person who was Fletcher's victim of sexual violence at the age of 11 said, "Tell him Wilson about reversing him" and threaten to punish God for lying. "
In 2004, Fletcher was found guilty of sexually assaulting nine children and died in prison two years later.