James Leslie "Les" McMahon (26 February 1930 – 23 January 2015) was an Australian politician.

In 1975, he was elected to the Australian House of Representatives as the Labor member for Sydney, a position he held until his retirement in 1983 after being deselected for the seat in favour of Peter Baldwin.

[3] On 11 February 2015, the Australian Federal Parliament observed a moment of silence in honor of McMahon following his death.

[4] The current sitting Labor member of the Federal seat of Sydney, Ms Tanya Plibersek described McMahon as "a man of strong convictions" and quoted:[5] McMahon's loyalty remained always to the Labor Party.

It is a measure of the man that, when he was defeated as a sitting member in a preselection, he handed out for the winning candidate on election day.