Fred Knee (16 June 1868 – 8 December 1914) was a British trade unionist and socialist politician.
Born in Frome, Somerset, Knee became a printer and moved to London in search of work.
By 1892, Knee was living in Wimbledon and had joined the Social Democratic Federation and the Co-operative Society.
Even as an adult, Fred barely reached 5 feet in height and was plagued by ill health: he became known as 'The Mighty Atom'.
Knee remained a prominent member of the SDF and its successor, the British Socialist Party.