Yaesu is a Japanese brand of amateur radio equipment, founded as Yaesu Musen Co., Ltd. in 1959 by a Japanese radio amateur Sako Hasegawa in Yaesu, Japan, a district of Tokyo.

Amateur radio, also known as ham radio, is the use of the radio frequency spectrum for purposes of non-commercial exchange of messages, wireless experimentation, self-training, private recreation, radiosport, contesting, and emergency communications. The term "amateur" is used to specify "a duly authorized person interested in radioelectric practice with a purely personal aim and without pecuniary interest"; and to differentiate it from commercial broadcasting, public safety, or professional two-way radio services.