Lawren Stewart Harris, CC (October 23, 1885 – January 29, 1970) was a Canadian painter. He was born in Brantford, Ontario, and is best known as a member the Group of Seven who pioneered a distinctly Canadian painting style in the early twentieth century. A.Y. Jackson has been quoted as saying that Harris provided the stimulus for the Group of Seven. During the 1920s, Harris's works became more abstract and simplified, especially his stark landscapes of the Canadian north and Arctic. He also stopped signing and dating his works so that people would judge his works on their own merit and not by the artist or when they were painted.

In 1969 he was made a Companion of the Order of Canada.

Lawren Harris was born on October 23, 1885 in Brantford, Ontario into a wealthy family – the Harrises of the Massey - Harris industrialists. He attended Central Technical School and St. Andrew's College in Toronto. From age 19 (1904 to 1908) he studied in Berlin. He was interested in philosophy and eastern thought. Later, he became involved in Theosophy and joined the Toronto Lodge of the International Theosophical Society. Lawren went on to marry Beatrice (Trixie) Phillips on January 20, 1910, and together had three children born in the first decade of their marriage. Soon after meeting and becoming friends with J.E.H. MacDonald in 1911, they together formed the Group of Seven. The Studio provided artists with cheap or free space where they could live and work.

Later in 1918 and 1919, Lawren Harris with J.E.H. MacDonald financed boxcar trips for the artists of the Group of Seven to the Algoma region. Another painting trip after Algoma was to Lake Superior's North Shore with A.Y. Jackson. Harris was so passionate about the North Shore and fascinated by the theosophical concept of nature, he returned annually for the next seven years. There he developed the style he is best known for. Harris’s paintings in the early 1920s were characterized by rich, decorative colours that were applied thick, in painterly impasto. He painted landscapes around Toronto, Georgian Bay and Algoma. His first trip to the Rockies in 1924 soon became annual, too, for the next three years. In 1930, Harris’s landscape paintings became simplified as he sailed with A.Y. Jackson aboard a supply ship. Several members of the Group of Seven later became members of the Canadian Group of Painters including Lawren Harris, A.J. Casson, Arthur Lismer, A.Y. Jackson, and Franklin Carmichael.

His school - time friend F.B. Housser was married in 1914 to a woman named Bess. Harris and Bess fell in love, but saw no way forward. For the two to divorce their spouses and marry would cause an outrage.

Harris finally left his wife of 24 years, Trixie, and his three children, and married Bess Housser in 1934. Harris was threatened with charges of bigamy by Trixie’s family because of his actions. Later that year he and Bess left their home and moved to the United States. Then in 1940 they moved to Vancouver, British Columbia, where Harris entered his abstract phase.

Lawren Harris died in Vancouver in 1970, a well known artist. To Harris, art was “a realm of life between our mundane world and the world of the spirit.”

On Tuesday May 29, 2001, Lawren Harris's Baffin Island painting was sold for a record of $2.2 million. Before the auction, experts predicted the painting done by one of the original Group of Seven would top $1 million, but no one expected it to fetch more than double that. The painting, which has always been in private hands, depicts icy white mountains with a dramatic blue sky. Lawren Harris's Algoma Hill was stored in a backroom closet in a Toronto hospital for years and was almost forgotten about until cleaning staff found it. The hospital sold it at a Sotheby's auction, in 2005, for $1.38 million CDN. On May 23, 2007, Pine Tree and Red House, Winter, City Painting II by Harris came up for auction by Heffel Gallery in Vancouver, BC. The painting was a stunning canvas from 1924 that was estimated to sell between $800,000 - $1,200,000. The painting sold for a record breaking $2,875,000 (premium included). Harris's Nerke, Greenland painting sold at a Toronto auction for $2 million (four times the pre-sale estimate) on November 24, 2008.