A sport in which the Josephians have been particularly dominant, winning the last 16 consecutive National swimming Championships. Swimmers make major commitments and sacrifices, arriving at 5 am to train in the ice-cold water until sunrise. With the provision of ample state of the art facilities such as an Olympic standard swimming pool, which was declared open on the 30th of July 1952, it also in fact happens to be the first of its kind in a Sri Lankan school. Over the last 2 decades, the standards of College swimming have reached heights never thought to be possible before, under the guidance of the coach Mr. Ruwan Manawadu.