Hexaaza-18-crown-6 is the macrocyclic ligand with the formula (CH<sub>2</sub>CH<sub>2</sub>NH)<sub>6</sub>. A white solid, this compound has attracted attention as the N6-analogue of 18-crown-6. It functions as a hexadentate ligand in coordination chemistry. It is the parent hexaaza-crown ether.
Its protonated derivatives bind anions via multiple hydrogen bonds.