Holzappel is a municipality in the Rhein-Lahn-Kreis, Rhineland-Palatinate, Germany, with a population in 2006 of 1100.

It belongs to the association community of Diez.

Holzappel was a county and state of the Holy Roman Empire from 1643 until 1714.

It was founded by Peter Melander, an imperial field marshal during the Thirty Years' War.

This Rhein-Lahn location article is a stub.