Knigge

People:
 * Adolph Franz Friedrich Ludwig (Freiherr von) Knigge (1752–1796), a German writer
 * Rolf Peter Knigge (1951–1990), a German pop singer/songwriter

Etiquette
 * Adolph Freiherr Knigge's 1788 book On Human Relations is still often referred to as Knigge
 * Derived from the above, any ruleset or book that concerns itself with etiquette