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SUMMARY: Total internal reflection (TIR) and attenuated total reflection (ATR) measurements in the Kretschmann configuration have been performed at 25 8C with poly(methyl methacrylate) (PMMA) films (of ca. 2.5 lm thickness) spincoated on top of a 50 nm thick gold layer, as a function of the applied hydrostatic pressure, ranging from p = 1 N 10 5 to 1 050 N 10 5 Pa. The analysis of guided optical modes allows for the separate determination of the refractive index n and the thickness d of the polymer films as a function of pressure. The pressure media in contact with the PMMA films were water, ethanol, and methanol. Thermodynamic theories for the density of solids and fluids in combination with the Lorentz-Lorenz equation for their optical properties fit the experimental data quite well.