The crystal structure of diethylammonium tetrachloro(p-phenoxyphenyl)tellurate has been determined by the heavy atom method. The crystals are monoclinic, space groupC2/c, with unit cell dimensionsa = 19.675(5),b = 7.634(3),c = 28.716(6) Å, β = 105.58(2)°, andZ = 8. For 2636 "observed" reflections (I > 3σ(I)),R = 0.030. The primary geometry about tellurium is based on a square pyramid with a secondary interaction on the vacant side of the tellurium coordination octahedron. The ions are apparently linked by weak interionic hydrogen bonding along the crystallographicbaxis.