This essay surveys responses to Macpherson's Ossian in Irish literature, alongside analysis of the development of literary Celticism. Despite being a key text behind the development of Celticism in Irish writing, Ossian is consciously rejected in Irish Romanticism and in the Celtic Revival. However, Ossian becomes a symbol of literary recycling and mental fragmentation in Irish Modernism. Texts studied in this essay include Owenson's The Wild Irish Girl, Joyce's Finnegans Wake, and Beckett's Murphy.