Mac Carthaigh’s Book is a collection of annals of the period AD 1114–1437 inclusive.
It was compiled from earlier material by Fínghin Mac Carthaigh Mór (c. 1560–1640) an Irish nobleman who was imprisoned for years in London.
While in London in 1633 he employed Diarmaid Ó Súilleabháin who also kept the book in his castle until it was sacked by Radhulbh MacAmlaoibh, then his clan took control of it, they copied and compiled these annals for him.
Mac Carthaigh's Book is important as one of the few native records of events in southern Ireland for the period it covers and it provides information on the effect the Norman Invasion had on Munster.
Besides relying on other Irish annals it drew upon some foreign sources, notably Giraldus Cambrensis' Expugnatio Hibernica.