Three-photon absorption coefficients and the corresponding three-photon absorption cross-sections of several simple molecular liquids at 400 nm are obtained from intensity dependent transmission measurements. The peak power of the femtosecond laser pulses was varied from 10 12 to 10 15 W/m 2. For all liquids investigated the three-photon absorption coefficient was found to be close to 1×10 −27 m 3/W 2.