Thomas Lake Harris (May 15, 1823 – March 23, 1906) was an Anglo-American Universalist minister, spiritualistic prophet, poet, and vintner. Harris is best remembered as the leader of a series of communal religious experiments, culminating with a group called the Brotherhood of the New Life in Santa Rosa, California.

Thomas Lake Harris was born May 15, 1823, at Fenny Stratford in Buckinghamshire, England. His parents were strict Calvinistic Baptists and very poor. When Harris was five years old his parents emigrated from England, settling in the town of Utica, New York. His mother died when he was still a young boy and Harris was forced by circumstances to help support the family from the age of 9.

At the age of 21 Harris became a Universalist minister, preaching to the congregation of the Fourth Universalist Society in the City of New York.

In 1848, he became minister of an independent Christian congregation in New York City. In that church he came into contact with a young newspaper publisher, Horace Greeley, who was so moved by one of Harris's sermons that he was inspired to organize Harris's congregation to help found the New York Juvenile Asylum.

Harris soon turned towards spiritualism, becoming a devotee of the Swedish mystic Emanuel Swedenborg. By 1851 he had departed New York for Virginia, where, together with Rev. J. L. Scott, he launched the first of his communal enterprises, the Mountain Cove Community of Spiritualists, on pristine land, claimed by one of the group's leaders to be the actual site of the Garden of Eden. The intention was to create a "city of refuge" from which angels were to descend and ascend. The experiment was racked by squabbles over property and personalities, and after two years, the Virginia commune collapsed.

Following the collapse of the Mountain Cove Community, Harris went back to his native England, where he preached modified Swedenborgian ideas to a London congregation for several years. There he began his career as a writer and poet, and published several books. Harris's poetry was well-regarded and he was the subject of a chapter by Alfred Austin in his book The Poetry of the Period.

Harris subsequently returned to America, settling in the town of Amenia in Dutchess County, New York. He remained at Amenia for five or six years, established a bank, a flour mill, and a vineyard, and gathered around him a small group of devoted religious disciples. Included among the approximately sixty converts were five orthodox clergymen and about 20 Japanese from Satsuma Province. The community—the Brotherhood of the New Life—settled at the village of Brocton, New York on the shore of Lake Erie. The nature of the community was co-operative rather than communistic. Harris's followers, numbering at one time about 2,000, in the United States and Great Britain, engaged in farming and industrial occupations. He taught his community that a change in qd was the mode of respiration which was the visible sign of possession by Christ and the seal of immortality.

In Brocton, Harris established a winemaking industry. In reply to the objections of teetotallers, Harris said that the wine prepared by himself was filled with the divine breath so that all noxious influences were neutralized. Harris also built a tavern and strongly advocated the use of tobacco.