Pell abused two choir boys in the rooms of a Melbourne cathedral in 1996, a jury found. He had pleaded not guilty.
The verdict was handed down in December, but it could not be reported until now due to legal reasons.
Pell is due to be sentenced on Wednesday. He has lodged an appeal against his conviction.
As Vatican treasurer, the 77-year-old cardinal was one of the Church's most powerful officials.
His trial was heard twice last year because a first jury failed to reach a verdict.