Salix myrtilloides (swamp willow) is a willow native to boglands in cool temperate to subarctic regions of northeastern Europe and northern Asia from central Norway and Poland eastwards to the Pacific Ocean coasts, with isolated populations further south in mountain bogs in the Alps, Carpathians and Sikhote-Alin mountains. The leaves resemble bilberry (Vaccinium uliginosum) leaves in shape, hence the name in the Finnish and Swedish languages, which translates as "bog bilberry willow".