zaštitnik

1. protector; defender
   Stariji brat je uvek bio moj zaštitnik. — My older brother was always my protector.
   On se predstavlja kao zaštitnik prirode. — He presents himself as a defender of nature.
2. (in religion) patron saint
   Sveti Nikola je zaštitnik naše porodice. — Saint Nicholas is the patron saint of our family.
3. (zaštitnik građana) ombudsman
   Podneli su žalbu Zaštitniku građana. — They filed a complaint with the Ombudsman.

The feminine form is zaštitnica.