An tOileánach is a novel written by the Irish author Tomás Ó Criomhthain. It is an autobiographical account of life on the remote Great Blasket Island off the coast of County Kerry, Ireland. The book provides insights into the daily lives, traditions, and struggles of the island's inhabitants in the early 20th century. The narrative is notable for its rich descriptions of the island's natural beauty and the close-knit community. It also highlights the challenges faced by the residents, including isolation and the decline of the Irish language. An tOileánach is considered an important work in Irish literature and cultural history.