Z23 may refer to:

• Z23 (computer), a computer built by Konrad Zuse in 1961
• German destroyer Z23, a destroyer built for the Kriegsmarine in the late 1930s

• Robert W. Buntrock
• Robert W. Castle
• Robert W. Chandler
• Robert W. Cort
• Robert W. Crown
• Robert W. Dean
• Robert W. Decker
• Robert W. Duplessie
• Robert Weatherill
• Robert Weaver (MP)
• Robert Webb (actor)
• Robert Webb (comedian)
• Robert Webb (cricketer, born 1806)
• Robert Webb (education)
• Robert Weber (handballer)
• Robert Weddell
• Robert Wegner
• Robert Weil (editor)
• Robert Weingard
• Robert Weinman
• Robert Weir Schultz
• Robert Weisbord
• Robert Weiss (dancer)
• Robert Welch Hall
• Robert Welch (Wisconsin politician)