Willy Georg Kükenthal (August 4, 1861, Weißenfels – August 20, 1922, Berlin) was a German zoologist.
He was the older brother of botanist and theologian Georg Kükenthal (1864–1955).
Kükenthal specialized in the Octocorallia and on marine mammals.
He edited, along with Thilo Krumbach, a landmark series of eight volumes in the Handbuch der Zoologie series which extensively reviewed and compiled the state of zoological knowledge of the time.