ZD

Zd or ZD may refer to:

• Nissan ZD engine, an automobile engine
• Zero Defects, a management program to eliminate defects in industrial production, popular in American industry in the late 1960s
• Zero-defects mentality, in which a command-and-control structure does not tolerate mistakes
• Zertifikat Deutsch, a certificate of German language ability
• Ziff Davis, a magazine publisher and Internet information provider
• Zooey Deschanel, an American actress and musician