Three-phase flows are encountered in air-lift pumps, preheaters and reactors, and other industrial plants. It is necessary to clarify not only macroscopic characteristics such as pressure drops and volume fractions of each phase but also local characteristics such as spatial distnbutions of local volume fractions and local velocities of each phase. In the present review, measurement techniques of volumetric fluxes and volumetric fractions of each phase, radial distributions of gas and solid volume fractions and liquid velocities were described for the three-phase bubbly flow. Those of length and velocities of large bubble liquid slug and film thickness of large bubble were also described for the three-phase slug flow Furthermore, application of measurement techniques for two-phase flows to three-phase flows were examined.