P-V-T equation of state for epsilon-FeOOH was determined from in situ X-ray diffraction experiment at pressures to 11 GPa and temperatures to 700 K. A fit to the second-order Birch-Murnaghan equation of state yielded isothermal bulk modulus K0, 300K = 143(8) GPa, the volumetric thermal expansion coefficient 2×10-5 K-1, and the temperature dependence of bulk modulus (dK/dT)P = -0.02 GPa/K.