The Abert's Squirrel or Tassel-eared Squirrel (Sciurus aberti) is a tree squirrel that is native to the Rocky Mountains from United States to Mexico, with concentrations found in Arizona, The Grand Canyon, New Mexico, and Durango.

The Abert's squirrel is named after Colonel John James Abert, an American naturalist and military officer who headed the Corps of Topographical Engineers and organized the effort to map the American West in the 1800s.