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
This disambiguation page lists articles associated with the title ZD.
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