The Ballarat diocese of the Catholic Church will face the Victorian Parliamentary inquiry into child sex abuse today.

The inquiry began last year and is investigating the handling of abuse by religious and other organisations.

Other church figures, including St John of God Brothers and the Salesians will also appear today.

Judy Courtin, a lawyer who is researching sexual abuse, says she doubts victims will get much solace from the Catholic Church's testimony.

"I think we will get a lot of spin in a very similar way to the evidence that's going to be given to the inquiry by the Melbourne Archdiocese," she said.

"I think victims and survivors have very little faith that they're going to tell the truth."

Nevertheless, she says it is an important day for victims and their families.