Zek may refer to:
- Achmet Zek, a character from the serial film Tarzan the Tiger
- Centre for the Study of the Causes of the War, a think-tank based in Berlin
- Zek, a character from the TV series Star Trek: Deep Space Nine
- Zek, a term for prisoners in Soviet Gulags
- Zentralstelle für Kreditinformation, a Swiss organisation centralizing and listing every credit attached to someone
