Lampeter, UK - The governing body of the Church in Wales will hold a vote on whether women priests should be allowed to become bishops.
The controversial bill, which has been proposed by six diocesan bishops, will be looked at by 140 members at a meeting in Lampeter.
The Archbishop of Wales has backed the idea and said he cannot see how the church can logically exclude women.
If it succeeds, England will the only UK region not to have female bishops.
If the vote is passed by a two-thirds majority in each section of the governing body, the change in Wales would come into affect immediately.
The Archbishop of Wales, Dr Barry Morgan, said he will be voting in favour of the bill.
He said: "I do not personally see how having agreed to ordaining women to both the diaconate and priesthood the church can logically exclude women from the episcopate."
The Right Reverend John Stewart Davies, Bishop of St Asaph, is also supporting the bill.
He said: "The most compelling reason for bringing forward the bill is that we should be able to widen the field of potential candidates.
"Women are making a major contribution to our ordained ministry in almost every area of church life.
"There's an enormous amount of talent out there and why should they not be included as potential candidates for bishops? That's the heart of the matter."
Opposition
But last December more than 100 clergy from the Church in Wales signed a letter published in the Church Times warning they would not accept the ministry of women bishops.
The Reverend Roy Doxsey, of St German's Church in Cardiff, is against the bill.
He said: "The bishops are in the apostolic succession and while our Lord had hundreds of disciples, amongst them many, many women, out of those hundreds of disciples he only selected 12 and they were all male."
Others opposing the bill question whether it was right to change something which is part of tradition.
Women have been ordained as priests within the church in Wales since January 1997.
The vote will be take place at the University of Wales, Lampeter.