Pope Benedict XVI has formally approved a miracle attributed to his late predecessor, paving the way to John Paul II's beatification on 1 May.
The process of beatification, or declaring the late pontiff to be "blessed", is a crucial step towards making him a saint.
John Paul died in 2005 after a papacy of nearly 27 years.
The Vatican credits him with the miraculous cure of a nun said to have had Parkinson's Disease.
Church officials believe that the Polish pope, who himself suffered from the condition, interceded for the miraculous cure of Sister Marie Simon-Pierre, a Frenchwoman in her late forties.
She has said her illness inexplicably disappeared two months after John Paul II's death, after she and her fellow nuns had prayed to him.
Church-appointed doctors agreed that there was no medical explanation for the curing of the nun, although last year there were some doubts about the validity of the miracle.
A Polish newspaper said that a doctor who scrutinised the nun's case had concluded that she might have been suffering not from Parkinson's, but from a nervous disorder from which temporary recovery is medically possible.
In order for John Paul II to be canonised as a saint, a second miracle will have to be verified following the beatification.