Robert Warren (1829–1915) was an Irish ornithologist.
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.
In 1900 he was co-author with Richard J. Ussher of The Birds of Ireland.
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