Capitan O'Brien-class submarine (1928)

The Capitan O'Brien class were three submarines built for the Chilean Navy in the late 1920s. They were similar to the contemporary British Odin class submarines, but mounted a larger 4.7 inch deck gun and were slightly smaller.

Ships
All boats were built by Vickers in Barrow-in-Furness and commissioned in 1929

The two Oberon class submarines purchased by Chile in the 1970s were also known locally as the O'Brien class.