The Neutron Inelastic Scattering (NIS) spectrum of deuterated tetrahydrofuran d(g)-THF has been recorded between 20 and 2000 cm(-1). The lowest frequency internal vibration is located at 120 +/- 5 cm(-1), in good agreement with the solid state Raman spectrum. The NIS spectrum has been simulated using the results of a Quantum Mechanical calculation (E. Gallinella, B. Cadioli, J.P. Flament and G. Berthier, J. Mol. Struct (Theochem), in press) which also agrees with the experimental frequencies using a scale factor of 0.95.