Samuel Taylor Coleridge (/ˈkoʊ.lə.rɪdʒ/ KOH-lə-rij; 21 October 1772 – 25 July 1834) was an English poet, literary critic, philosopher, and theologian who was a founder of the Romantic Movement in England and a member of the Lake Poets with his friend William Wordsworth. He also shared volumes and collaborated with Charles Lamb, Robert Southey, and Charles Lloyd.

He wrote the poems The Rime of the Ancient Mariner and "Kubla Khan", as well as the major prose work Biographia Literaria. His critical works were highly influential, especially in relation to William Shakespeare, and he helped introduce German idealist philosophy to English-speaking cultures. Coleridge coined many familiar words and phrases, including "suspension of disbelief". He had a major influence on Ralph Waldo Emerson and American transcendentalism. Throughout his adult life, Coleridge had crippling bouts of anxiety and depression; it has been speculated that he had bipolar disorder, which had not been defined during his lifetime. He was physically unhealthy, which may have stemmed from a bout of rheumatic fever and other childhood illnesses. He was treated for these conditions with laudanum, which fostered a lifelong opium addiction.

Coleridge had a turbulent career and personal life with a variety of highs and lows, but his public esteem grew after his death, and he became considered one of the most influential figures in English literature. For instance, a 2018 report by The Guardian labelled him "a genius" who had progressed into "one of the most renowned English poets". Organisations such as the Church of England celebrate his work during public events, such as a "Coleridge Day" in June, with activities including literary recitals.

Coleridge was born on 21 October 1772 in the town of Ottery St Mary in Devon, England. Samuel's father was the Reverend John Coleridge, the well-respected vicar of St Mary's Church, Ottery St Mary, and was headmaster of the King's School, a free grammar school established by King Henry VIII in the town. He had previously been master of Hugh Squier's School in South Molton, Devon, and lecturer of nearby Molland.

John Coleridge had three children by his first wife. Samuel was the youngest of ten by the Reverend Mr. Coleridge's second wife, Anne Bowden (1726–1809), probably the daughter of John Bowden, mayor of South Molton, Devon, in 1726. Coleridge suggests that he "took no pleasure in boyish sports" but instead read "incessantly" and played by himself.

After John Coleridge died in 1781, 8-year-old Samuel was sent to Christ's Hospital, a charity school which was founded in the 16th century in Greyfriars, London, where he remained throughout his childhood, studying and writing poetry. At that school Coleridge became friends with Charles Lamb, a schoolmate, and studied the works of Virgil and William Lisle Bowles.

In one of a series of autobiographical letters written to Thomas Poole, Coleridge wrote: "At six years old I remember to have read Belisarius, Robinson Crusoe, and Philip Quarll – and then I found the Arabian Nights' Entertainments – one tale of which (the tale of a man who was compelled to seek for a pure virgin) made so deep an impression on me (I had read it in the evening while my mother was mending stockings) that I was haunted by spectres whenever I was in the dark – and I distinctly remember the anxious and fearful eagerness with which I used to watch the window in which the books lay – and whenever the sun lay upon them, I would seize it, carry it by the wall, and bask, and read."

Coleridge seems to have appreciated his teacher, as he wrote in recollections of his school days in Biographia Literaria: