Pine squirrels are squirrels of the genus Tamiasciurus, in the Sciurini tribe, of the large family Sciuridae.

Pine squirrels can be found in the northern and western United States, most of Canada, Alaska, and northwestern Mexico.

The name Tamiasciurus comes from Greek wiktionary:ταμίας tamías ‘steward, dispenser’ and wiktionary:σκίουρος skíouros 'squirrel'.

The American red squirrel should not be confused with the Eurasian red squirrel (Sciurus vulgaris) — both are usually just referred to as the "red squirrel" in their home continents.

Pine squirrels rely on a variety of food sources including fungi, plants, arthropods and tree seed.