The genus Phenacomys is a group of North American voles. The genus name comes from the Greek for "imposter mouse."

These animals live in forested, alpine and tundra areas, which often include plants of the heath family. They are small rodents with long fur and short ears, legs and tails. They eat green plants, seeds and berries in summer and bark and buds of shrubs at other times. Predators include mustelids, owls and hawks.

Some sources include the tree voles, genus Arborimus, in this genus. At one time, the two species of heather vole were considered to be a single species.

The complete list of species is:

• Western Heather Vole (Phenacomys intermedius)
• Eastern Heather Vole (Phenacomys ungava)

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