Thomas John Thomson (August 5, 1877 – July 8, 1917) was a Canadian artist active in the early 20th century. During his short career, he produced roughly 400 oil sketches on small wood panels and approximately 50 larger works on canvas. His works consist almost entirely of landscapes, depicting trees, skies, lakes, and rivers. He used broad brush strokes and a liberal application of paint to capture the beauty and colour of the Ontario landscape.