Officers said Sister Agnes Pennino was seen taking the items from the Surplus Outlet near Berwick.
Police determined the woman captured on surveillance video was the nun who lived about 20 miles away at a convent in Danville.
Officials from Saints Cyril and Methodius Convent declined to comment.
Shoplifting is a summary offence, meaning the nun will probably be fined if she is convicted.
Store manager Zane Kishbach said he "couldn't believe it that a nun would actually do something like that".