Harold Eric Thonemann (28 October 1890 – 5 August 1962) was an Australian politician.
He attended Melbourne Grammar School and served with the Royal Field Artillery during World War I.
After the war he became a sharebroker, and on 20 June 1922 married Nora Kate (Tui) Shields, with whom he had two children.
He was a member of the Melbourne Stock Exchange from 1927 and director of a number of companies; he also owned extensive grazing land, mostly in the Northern Territory.
In 1941 he won a by-election for the Victorian Legislative Assembly seat of Toorak.