An experiment is performed to show that the near-field hydrodynamic flow noise (generated by a submerged water jet) is enhanced when the turbulent flow is modified to become a two-phase flow containing air bubbles. Pressure spectra, in the band 5–5000 Hz, are measured using a digital spectral analyzer from signals generated by a hydrophone placed at the axial and radial position (Z=4D and R=4D) from the nozzle exit diameter, D=0.635 cm. An amplification factor, G=∫ptwo-phase2 df/∫psingle-phase2 df, is measured as a function of the gross void fraction β of the air bubbles. Here, we measure β to be the ratio of gas volume flow rate (through the bubblemaker located at the nozzle entrance) to the water volume flow rate, Qg/Qw. The amplification G is measured as a function of β by keeping Qw constant (the nozzle velocity U=13.8 m/s) and varying Qg. Results show that G∼β2 and G∼20 at β=0.0065. The mean-squared pressure fluctuation p2≡∫ptwo-phase2 df is measured as a function of U by keeping Qg fixed and varying Qw. Results show that p2∼Um, where m=3.6, 4.3, and 4.7 for Qg=50, 86, and 136 sccm, respectively. [Work supported by NCPA.]