Former oceanographic research ship CSS Acadia

CSS Acadia is a former hydrographic surveying and oceanographic research ship of the Hydrographic Survey of Canada and its successor the Canadian Hydrographic Service.

The Acadia served Canada for more than five decades from 1913-1969, including being commissioned twice into military service for the Royal Canadian Navy during both world wars. She is currently a historic museum ship stationed in Halifax Harbour at the Maritime Museum of the Atlantic; she is the only ship still afloat that served the Royal Canadian Navy in both World Wars.

Retaining her original engines, boilers and little-changed accommodations, she is one of the best preserved Edwardian ocean steamships in the world and a renowned example of Canada's earliest scientific prowess in the fields of hydrography and oceanography.