Turret castings, superficial details, and equipment differed between factories; new features were added in the middle of production runs, or retrofitted to older tanks; damaged tanks were rebuilt, sometimes with the addition of newer-model equipment and even new turrets.

[1] Some tanks had appliqué armor made of scrap steel of varying thickness welded onto the hull and turret; these tanks are called s ekranami ("with screens"), although this was never an official designation for any T-34 variant.

German intelligence in World War II referred to the two main production models as T-34/76 and T-34/85 with minor models receiving letter designations such as T-34/76A—this nomenclature has been widely used in the west, especially in popular literature.

Because many different factories manufactured T-34s, with components built by subcontractors, the listing below merely gives a broad overview and does not capture every possible variant.

112 continued building narrow-turret 76 mm armed models long after all other plants had switched to hexagonal-turreted tanks.