In the title compound, [PtCl(C(27)H(35)N(3))]Cl·C(7)H(8), the Pt(II) atom is coordinated in a pseudo-square-planar fashion by the N atoms of a 4,4',4''-tri-tert-butyl-2,2':6',2''-terpyridine (tbtrpy) ligand and a Cl atom. The Pt-N distance of the N atom on the central pyridine is 1.941 (4) Å, while the peripheral N atoms have Pt-N distances of 2.015 (4) and 2.013 (4) Å. The Pt-Cl bond distance is 2.3070 (10) Å. The cations pack as dimers in a head-to-tail orientation with an inter-molecular Pt⋯Pt distance of 3.2774 (3) Å and Pt⋯N distances of 3.599 (4), 3.791 (4) and 4.115 (4) Å. The solvent mol-ecule is disordered and occupies two positions with a ratio of 0.553 (6):0.447 (6).