Abstract: A system for rainwater harvesting utilizes a rain barrel adapted for collecting and storing rainwater runoff gravity-fed from a rooftop through a downspout. A downspout diverter comprises an inlet section, an outlet section, and an elongated connector section interconnecting the inlet section and the outlet section. The inlet section has a first open end adapted for communicating with an end of the downspout and a second open end communicating with an inlet opening formed with the rain barrel. The outlet section of the diverter has a first open end communicating with an outlet (or, overflow) opening formed with the rain barrel and a second open end for directing rainwater outwardly from the rain barrel.