Thomas Sydney Battersby (18 November 1887 – 3 September 1974) was an English competition swimmer who represented Great Britain in freestyle events at two consecutive Olympic Games.

[1] At the 1908 Summer Olympics hosted by London, he won a silver medal in the men's 1500-metre freestyle, finishing second with a time of 22:51.2, behind fellow Briton Henry Taylor (22:48.4), and ahead of Australian Frank Beaurepaire (22:56.2).

[3] Four years later, at the 1912 Summer Olympics in Stockholm, Sweden, Battersby won a bronze medal as a member of the third-place British men's team in the 4×200-metre relay.

[3] During his competitive swimming career, Battersby set four world records in freestyle events, including the 400-metre, 330-yard, 440-yard and one-mile distances.

He fell short of breaking the world record but did set a new British national mark.