Hyosciurus is a genus of rodents in the family Sciuridae endemic to Sulawesi, Indonesia. It contains the following species:

• Montane long-nosed squirrel (Hyosciurus heinrichi)
• Lowland long-nosed squirrel (Hyosciurus ileile)

The genus name is a combination of Greek hys, hyos, meaning 'pig', and skiouros, meaning 'squirrel', in reference to the snouts which are relatively long compared to other squirrels.

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