The results of recent ambient‐noise investigations, after appropriate processing, are compared on the basis of pressure spectra in the frequency band 1 cps to 20 kc. Several possible sources are discussed to determine the most probable origin of the observed noise. It is concluded that, in general, the ambient noise is a composite of at least three overlapping components:turbulent‐pressure fluctuationseffective in the band 1 cps to 100 cps; wind‐dependentnoise from bubbles and sprayresulting, primarily, from surface agitation, 50 cps to 20 kc; and, in many areas,oceanic traffic, 10 cps to 1000 cps. Spectrum characteristics of each component and of the composite are shown. Additional sources, including those of intermittent and local effects, are also discussed. Guidelines for the estimation of noise levels are given.