The Book of Leinster is a medieval Irish manuscript compiled c. 1160 and now kept in Trinity College Dublin, under the shelfmark MS H 2.18. It was formerly known as the Lebor na Nuachongbála "Book of Nuachongbáil", a monastic site known today as Oughaval.

Oughaval, sometimes called Oakvale, is a townland in the civil parish of Stradbally, County Laois, in Ireland. It is the site of a sixth-century monastic settlement.