Wallace's fairywren (Sipodotus wallacii) is a species of bird in the Australasian wren family, Maluridae. It is monotypic within the genus Sipodotus. It is found in New Guinea and the Aru Islands, where its natural habitat is subtropical or tropical moist lowland forests.
Wallace's fairywren is a small species of fairywren, 11–12.5 cm in length and weighing 7–8 g. Adult males have a black crown and nape with blue feather tips and a black face with an incomplete white eye-ring and white ear-tufts. The scapulars and back are rusty brown, with brownish-grey upperwings, white underparts, and brown tails. The black beak is long, broad, straight, and bluntly pointed, with a white tip. The iris is red-brown, with short, flesh-brown legs. Females are similar to males, but have a pale yellowish wash to the throat and a duller crown. Subspecies coronatus has a creamy wash to the underparts. Immatures are duller than the adults, with shorter bills and ear-coverts, along with having the crown be speckled buff instead of blue.
Little is known about its vocalisations, but hissing see see see see calls are given by foraging parties.