C6H16N+.Cl-,Mr = 137.65, orthorhombic, P2(1)2(1)2(1), a = 7.825 (4), b = 8.257 (1), c = 13.268 (2) A, V = 857.3 (5) A3, Z = 4, Dx = 1.066 g cm-3, lambda(Mo K alpha) = 0.71073 A, mu = 3.6 cm-1, F(000) = 304, T = 295 K, R = 0.030 for 556 observations (of 901 unique data). Each H on the N atom is hydrogen bonded to a Cl atom. N--H...Cl bond lengths (N--Cl distance) are 3.180 (3) and 3.163 (3) A with N--H...Cl angles 176 (2) and 175 (2) degrees respectively. Each Cl atom is involved in two hydrogen bonds. The cation has an approximate twofold axis of symmetry.