John Dearness (13 May 1852 – 6 December 1954)[1] was a Canadian educator, botanist, and mycologist.
Largely self taught he conducted scientific studies in plant pathology leading to B.T.
From the 1880s he began collecting and documenting plants and fungi, publishing on the latter with J.B. Ellis.
In 1893 he was in charge of Ontario educational exhibit at the Chicago World Fair.
On his 100th birthday, a John Dearness Home for Elder Citizens was set up in Ontario.