William John Hopkinson (November 25, 1887 – February 21, 1970) was a Canadian artist best known for his en plein air style landscapes.
Although his talent was well respected and he went on painting trips with many leading painters, Hopkinson never achieved the same level of recognition as some of his contemporaries.
Hopkinson worked mainly in oils, with landscapes of forests, winter scenes and docked boats, but many pencil sketches have also survived.
This technique was suited to portraying the ruggedness of the landscape around him, showing fallen trees, forests and lakes under skies coloured in dramatic shades of blues, pinks and orange.
Hopkinson was honoured by the Ontario Society of Artists by having his painting "Town House" hung at the 70th annual spring exhibition being held at The Art Gallery of Toronto in 1942.