Wooden nail
Holznagel stands for:
- a nail made of wood, see wood connection
 - Onychauxis , a pathological change in fingernails or toenails.
 - Der Holznagel , the members' magazine of the Bauernhaus interest group
 
Holznagel is the family name of the following people:
- Bernd Holznagel (* 1957), German legal scholar
 - Reiner Holznagel (* 1976), German political scientist and President of the Taxpayers Association
 - Renate Holznagel (* 1949), Member of the Mecklenburg-Western Pomerania State Parliament (CDU)