| Sciurus deppei subsp. deppei Peters, 1863 |
| Sciurus deppei subsp. negligens E. W. Nelson, 1898 |
| Sciurus deppei subsp. vivax E. W. Nelson, 1901 |
| Sciurus douglasi Bachman, 1839 |
| Sciurus douglasi subsp. mearnsi Townsend, 1897 |
| Sciurus durangi Thomas, 1893 |
| Sciurus ferrugineiventris Schinz, 1845 |
| Sciurus ferruginiventris Audubon & Bachman, 1841 |
| Sciurus fossor Peale, 1848 |
| Sciurus goldmani E. W. Nelson, 1898 |
| Sciurus grammurus Say, 1823 |
| Sciurus griseoflavus Gray, 1867 |
| Sciurus griseoflavus subsp. chiapensis E. W. Nelson, 1899 |
| Sciurus griseoflavus subsp. griseoflavus Gray, 1867 |
| Sciurus griseus Ord, 1818 |
| Sciurus griseus subsp. anthonyi Mearns, 1897 |
| Sciurus hudsonius Erxleben, 1777 |
| Sciurus hudsonius subsp. mearnsi Townsend, 1897 |
| Sciurus hypopyrrhus Wagler, 1831 |
| Sciurus hypoxanthus I. Geoffroy St.-Hilaire, 1855 |