Much Victorian Irish studies has followed the Americanist Noel Ignatiev's famous claim that the Irish “became white” upon migration to the United States, whereas they had not been in the context of the United Kingdom. This article argues, in contrast, that an emphasis on the undeniable racialization of Irish poverty and politics can distract us from an important truth: nineteenth-century Irish people, in Britain and Ireland as well as in the United States, were broadly understood as white, and “Celticness” was not in any serious or widespread way treated as equivalent to Blackness, although that did not stop some nineteenth-century Irish advocates from drawing that misleading analogy. Drawing upon cultural and anthropological work of the mid-nineteenth century, from Robert Knox, Thomas Carlyle, and John Mitchel to Charles Kingsley, Matthew Arnold, and the caricaturists of Punch to Frederick Douglass, this article proposes that the implication that nineteenth-century Irishness was cognate to Blackness—or the Irish experience a version of the Black experience—represents the epistemological and ethical error that Frank B. Wilderson III has called “the ruse of analogy” that we must interrogate more critically lest we, in Wilderson's formulation, enact a “mystification, and often erasure, of Blackness's grammar of suffering.”