The molecular structure of W(PMe 3) 3 H 6 has been identified by low temperature (-123 ˚C) X-ray diffraction studies as a classical hydride compound, with a tricapped trigonal prismatic geometry in which two of the PMe 3 ligands adopt eclipsed positions on opposite triangular faces of the prism and one PMe 3 ligand caps a rectangular face. The solid state structure is reproduced well by density functional theory geometry optimization calculations on the molecule in the gas phase. NMR spectroscopic studies provide evidence that W(PMe 3) 3 H 6 also exists as a classical hydride compound in solution. For example, the T 1(min) value for the hydride ligands of W(PMe 3) 3 H 6 is 380 ms at 500 MHz and 310 ms at 400 MHz, values that are more in accord with a classical hydride formulation than a nonclassical one. Likewise, the W(PMe 3) 3 H 6-x D x isotopologues (obtained by isotope exchange with either deuterobenzene or deuterotoluene) exhibit upfield (+13 ppb) deuterium secondary isotope effects on the hydride chemical shift, which are also consistent with a classical description.