The Vatican City's ambassador to Australia will take part in the closure mass for Wagga's Carmelite Monastery on Wednesday.
Apostolic Nuncio, Most Reverend Adolfo Tito Yllana, will be one of the concelebrants at the mass, to be held at the Ashmont monastery at 4pm.
The monastery will close this month after 53 years in the city due to a lack of nuns joining the Carmelite order, which has its head monastery in Melbourne.
Catholic Diocese of Canberra-Goulburn Archbishop and Apostolic Administrator to the Diocese of Wagga, Christopher Prowse, will serve as the principal celebrant.
Wagga's Carmelite nuns were perhaps best known in the wider community for selling lamingtons and holding fetes as fundraisers.
The Carmelite Order is seeking offers to purchase the Monastery and its six-acre grounds with the preference of selling it to another religious group.