1,4,8,11-Tetraazaundecane, IUPAC name: N,N<nowiki/>'-bis(2-aminoethyl)propane-1,3-diamine, is the organic compound with the formula . It is a tetramine, consisting of two primary amines and two secondary amines positioned symmetrically. Like many amines, this compound has a high affinity for carbon dioxide. The compound can be prepared by treatment of 1,3-dibromopropane with excess ethylenediamine.
The compound has been examined often as a ligand in coordination chemistry. It is tetradentate ligand similar to 1,4,7,10-tetraazadecane. By condensation of its nickel(II) complexes with formaldehyde, one can obtain a variety of macrocyclic ligands.