The Siberian nuthatch (Sitta arctica) is a bird species of the family Sittidae. For a long time considered as a subspecies of the Eurasian nuthatch (S. europaea), it was clearly differentiated in 2006 on the basis of morphological and molecular characters. It is on average larger than the Eurasian nuthatch and also differs in some morphological features such as the shape of its bill, the size of its claws and the color of its underwing and outer rectrices. Its song has also been described as "distinctly different" from that of the Eurasian nuthatch, though without further clarification.