Hexaaza-18-crown-6 is the macrocyclic ligand with the formula (CH2CH2NH)6.

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.

[1] Its protonated derivatives bind anions via multiple hydrogen bonds.