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 to Thomas Morgan Harris and Annie J. Stewart (daughter of pastor William Boyd Stewart) in Brantford, Ontario into a wealthy family – the Harrises of the Massey-Harris industrialists. He attended Central Technical School and St. Andrew's College. 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. He financed the construction of a studio building in Toronto with friend Dr. James MacCallum. The Studio provided artists with cheap or free space where they could live and work.