Report on rare birds in Spain 2011. Current report gives details about 452 new records on the presence of 100 rare bird taxa in the whole of Spain. Acceptance index was of 88,94% from a grand total of 579 examined records including pending, duplicated and regional rarities. Details on 12 new taxa for Spain are included for the first time in any rarities report: Asian white-winged scoter Melanitta deglandi, Fea's petrel Pterodroma feae, first and second records, black-bellied storm-petrel Fregetta tropica, eastern imperial eagle Aquila heliaca, sandhill crane Grus canadensis, south polar skua Stercorarius maccormicki, Thayer's Gull Larus thayeri, american hawk-owl Surnia ulula caparoch, buff-bellied pipit Anthus rubescens, eastern black redstart Phoenicurus ochruros phoenicuroides, semicollared flycatcher Ficedula semitorquata and Cretzchsmar's bunting Emberiza caesia. Deserta's petrel, Thayer's gull and hawk owl are new to the Spanish list which was updated in 2012 having considered the rest of the above accepted firsts. The report deals with record numbers of goosander Mergus merganser, buff-breasted sandpiper Tryngites subruficollis and pectoral sandpiper Calidris melanotos besides overwintering episodes of Baird's sandpiper Calidris bairdii and broad-billed sandpiper Limicola falcinellus. Other interesting records are third records for Spain of African white-backed vulture Gyps africanus, upland sandpiper Bartramia longicauda or Baltic gull Larus fuscus fuscus.