Zer may refer to:
- Guz, an obsolete unit of length used in Persia and parts of Asia
- Zer, a gender-neutral pronoun
- Zer, a letter of the Urdu alphabet
- Zer, an inseparable verb prefix in German, usually adding the connotation of damage. For example - stören (to disturb, to bother) and zerstören (to destroy), malmen (to grind) and zermalmen (to pulverize, to crush), schlagen (to hit) and zerschlagen (to shatter).