Asahi-ku (旭) is one of the 18 wards of the city of Yokohama in Kanagawa Prefecture, Japan.

Asahi is located in eastern Kanagawa Prefecture, and on the northwest borders of the city of Yokohama.

The area around present-day Asahi Ward was formerly part of Tsuzuki District in Musashi Province.

During the Edo period, it was a rural region classified as tenryō territory controlled directly by the Tokugawa shogunate, but administered through various hatamoto.

Asahi Ward is largely a regional commercial center and bedroom community for central Yokohama and Tokyo.