In the title compound, [PtCl(C(27)H(35)N(3))]BF(4), the Pt(II) atom is in a pseudo-square-planar coordination, which is typical of Pt-terpyridine complexes. The Pt-Cl bond distance is 2.2998 (7) Å. The Pt-N distance of the N atom on the central pyridine is 1.931 (2) Å, while the peripheral N atoms have Pt-N distances of 2.018 (2) and 2.022 (2) Å. The cations pack as dimers in a head-to-tail orientation with an inter-molecular Pt⋯Pt distance of 3.5214 (2) Å and Pt⋯N distances of 3.527 (2), 3.873 (2) and 4.532 (2) Å. In the crystal, cations and anions are linked by weak C-H⋯F hydrogen-bonding inter-actions.