Lig Sinn i gCathú (Irish: "Lead us into temptation") is a novel by the Irish writer Breandán Ó hEithir. The story is set in the university town of Baile an Chaisil, a thinly disguised Galway City, in 1949, the year Ireland declared itself a republic and withdrew from the British Commonwealth. Máirtín Ó Mealóid, a pub-crawling university student, and his disreputable friends are too busy drinking and lusting after girls to pay much attention to this significant political development. The story takes place over four days from Thursday 14 April to Monday 18 April.