Heinzenberg is an Ortsgemeinde – a municipality belonging to a Verbandsgemeinde, a kind of collective municipality – in the Bad Kreuznach district in Rhineland-Palatinate, Germany. It belongs to the Verbandsgemeinde of Kirn-Land, whose seat is in the town of Kirn, although this lies outside the Verbandsgemeinde. With only 28 permanent inhabitants, Heinzenberg is the district’s smallest municipality.