Cín Lae Amhlaoibh is a diary written by Amhlaoibh Ó Súilleabháin (1780–1837) between the years 1827 to 1835. It is invaluable for the insight it gives into life in rural Ireland in the early 19th century, and is a rare example of an early modern diary written in the Irish language. Amhlaoibh's original manuscript is currently in the possession of the Royal Irish Academy.