Robert Warren (1829–1915) was an Irish ornithologist. Warren was born in Cork. In his early years he corresponded with fellow Irish ornithologist William Thompson. In 1851 he moved to Moyview, County Sligo, where he studied the birds of Killala Bay, Bartragh Island and the River Moy. He was co-author with Richard J. Ussher of The Birds of Ireland. An account of the distribution, migrations and habits of birds as observed in Ireland, with all additions to the Irish list. Gurney and Jackson, London. (1900).