In the title compound, [TbCl(C(27)H(35)N(3))(2)(H(2)O)](ClO(4))(2).2C(2)H(6)O, the Tb(III) ion has a coordination number of eight, composed of two tridentate substituted-terpyridine ligands, a water molecule and a bound Cl(-) anion. The first coordination shell can be described as a distorted bicapped trigonal prism. The dihedral angles between pyridine rings belonging to the same tpy ligand range from 5.2 (5) to 16.8 (5) degrees.