This chapter presents an overview of heat treating of nonferrous alloys. First, a brief discussion on the effects of cold work and annealing on nonferrous alloys is presented. This is followed by a discussion on the mechanisms involved in the more commonly used heat treating procedures for hardening or strengthening, namely solution treating and aging. Examples are presented for heat treating of two commercially important nonferrous alloys, one from the aluminum-copper system and one from the copper-beryllium system.