The Valley of the Squinting Windows is a 1918 novel by Brinsley MacNamara (born John Weldon), set in the fictional village of Garradrimna, in central Ireland.

While MacNamara insisted that Garradrimna could represent any village in Ireland, geographical landmarks mentioned in the book and correspondences between its characters and his neighbours suggest that Garradrimna is based on the author's hometown Delvin, County Westmeath; most notably, a de Lacy castle located at one end of the town.

Twenty years before the events of the book, Nan Byrne has a relationship with a local man, Henry Shannon, hoping to marry him for his wealth.

He makes a little as a labourer, whereas Nan works every day at sewing to support their only child, John, studying in England to become a Catholic priest.

John returns to Garradrimna for a holiday, where he befriends Ulick Shannon (son of Henry) and falls for Rebecca Kerr, a schoolteacher.