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The synthesized monoclinic (B-type) phase of Y2O3 has been investigated by in situ angle-dispersive x-ray diffraction in a diamond anvil cell up to 44 GPa at room temperature.A phase transition occurs from monoclinic (B-type) to hexagonal (A-type) phase at 23.5 GPa and these two phases coexist even at the highest pressure.Parameters of isothermal equation of state are V0 =69.0(1)(A)3,K0 =159(3) GPa,K10 =4 (fixed) for the B-type phase and V0 =67.8(2)(A)3,K0 =156(3) GPa,K10 =4 (fixed) for the A-type phase.The structural anisotropy increases with increasing pressure for both phases.