Joseph Whiteside had the following podium finishes at major championships: 2nd in the 1930 British Empire Games 4×200 yards Freestyle Relay (with Freddie Milton, Norman Brooks, and Arthur Watts). In the 1930 British Empire Games Whiteside also finished fourth in the 400 yards freestyle. In the British Empire Games he represented England.
|1928 Summer||21||Amsterdam||Swimming||Men's 4 × 200 metres Freestyle Relay||Great Britain||GBR||6|
|1932 Summer||25||Los Angeles||Swimming||Men's 100 metres Freestyle||Great Britain||GBR||4 h3 r1/3|
|1932 Summer||25||Los Angeles||Swimming||Men's 4 × 200 metres Freestyle Relay||Great Britain||GBR||5|
|1932 Summer||25||Los Angeles||Swimming||Great Britain||Round One||Heat Three||4||1:04.7|