Yaesu is an international brand of commercial and amateur radio equipment.

It was founded as Yaesu Musen Co., Ltd. (八重洲無線株式会社, Yaesu Musen Kabushiki-gaisha^?) in 1959 by a Japanese radio amateur Sako Hasegawa with callsign JA1MP in the Tokyo neighborhood of Yaesu. The initial intent seemed to have been to develop and manufacture commercial and amateur radio transceivers for the Japanese market but by 1964 there were sales agreements placed in Australia and Germany.

In Europe the equipment was sold under the Yaesu brand and the Sommerkamp brand. In 1963 the Swiss firm Sommerkamp imported Yaesu equipment and sold it using their own brand.

Yaesu's line of equipment was first imported into the US by Spectronics, Inc. located in Signal Hill, CA, in 1965. Yaesu became an important presence in the U.S. amateur radio market with the introduction and improvement of its very popular FT-101 line of equipment in the 1970s. In addition, transceivers were OEM'd to Henry Radio in Los Angeles. Spectronics was founded by William Turner, father of Robert Turner who went on to found EMG, Inc. manufacturer of EMG Pickups for electric guitars.

Yaesu (八重洲^?) is a neighborhood in Chūō, Tokyo, Japan, located north of Ginza, west of Nihonbashi and Kyōbashi, and adjacent to the east side of Tokyo Station. The Yaesu exit, which faces Nihonbashi, is recent and primarily provides access to the Shinkansen platforms.

The area was named after the 17th century Dutch adventurer Jan Joosten, who, for his services to Tokugawa Ieyasu, was granted a house in Edo (today's Tokyo). The area came to be called Yayosu Quay after him—his name was pronounced yan yōs'ten in Japanese—and the name exists in the name of Yaesu side of Tokyo Station. Yaesu Avenue has a monument dedicated to Jan Joosten and his life after his arrival in Japan on the Liefde with William Adams.

35°40′48″N 139°46′11″E / 35.680104°N 139.769806°E / 35.680104; 139.769806Coordinates: 35°40′48″N 139°46′11″E / 35.680104°N 139.769806°E / 35.680104; 139.769806 (Yaesu Avenue)