Harvey Hubbell II (born 1857, Connecticut) was an American inventor, entrepreneur, and industrialist.

Some of the equipment he designed included automatic tapping machines and progressive dies for blanking and stamping.

He quickly began selling his newly devised manufacturing equipment alongside his commercial products.

It allowed the adoption in the U.S. of convenient, portable electrical devices, which Great Britain had enjoyed since the early 1880s.

[4] In 1916, Hubbell was also granted a patent for a three-bladed power plug, including a ground prong, which Australian regulators and electrical accessory manufacturers adopted as the standard for that country in the 1930s.