The giant nuthatch (Sitta magna) is a species of bird in the Sittidae family. It is the largest species in the genus at 19.5 centimetres (7.68 in), and is largely grey in colour except for a faintly rufous underpart in the female, whose eyestripe is also duller than the male. The bill is much bulkier than other Sitta.Giant nuthatches are found in the mountains of southwestern China and northern Thailand, and may be extinct in Myanmar.