Thomas Hardy, OM (2 June 1840 – 11 January 1928) was an English novelist and poet. While his works typically belong to the naturalist movement, several poems display elements of the previous romantic and enlightenment periods of literature, such as his fascination with the supernatural.

While he regarded himself primarily as a poet who composed novels mainly for financial gain, during his lifetime he was much better known for his novels, such as Tess of the d'Urbervilles and Far from the Madding Crowd, which earned him a reputation as a great novelist. The bulk of his fictional works, initially published as serials in magazines, were set in the semi-fictional land of Wessex (based on the Dorchester region where he grew up) and explored tragic characters struggling against their passions and social circumstances. Hardy's poetry, first published in his fifties, has come to be as well-regarded as his novels and has had a significant influence over modern English poetry, especially after The Movement poets of the 1950s and 1960s cited Hardy as a major figure.

Thomas Hardy was born at Higher Bockhampton, a hamlet in the parish of Stinsford to the east of Dorchester in Dorset, England. His father (Thomas) worked as a stonemason and local builder. His mother Jemima was well-read and educated Thomas until he went to his first school at Bockhampton at age eight. For several years he attended a school run by a Mr Last. Here he learned Latin and demonstrated academic potential. However, a family of Hardy's social position lacked the means for a university education, and his formal education ended at the age of 16 when he became apprenticed to John Hicks, a local architect. Hardy trained as an architect in Dorchester before moving to London in 1862; there he enrolled as a student at King's College, London. He won prizes from the Royal Institute of British Architects and the Architectural Association. Hardy never felt at home in London. He was acutely conscious of class divisions and his social inferiority. However, he was interested in social reform and was familiar with the works of John Stuart Mill. He was also introduced to the works of Charles Fourier and Auguste Comte during this period by his Dorset friend Horace Moule. Five years later, concerned about his health, he returned to Dorset and decided to dedicate himself to writing.

In 1870, while on an architectural mission to restore the parish church of St Juliot in Cornwall, Hardy met and fell in love with Emma Lavinia Gifford, whom he married in 1874. Although he later became estranged from his wife, who died in 1912, her death had a traumatic effect on him. After her death, Hardy made a trip to Cornwall to revisit places linked with their courtship, and his Poems 1912 – 13 reflect upon her passing. In 1914, Hardy married his secretary Florence Emily Dugdale, who was 39 years his junior. However, he remained preoccupied with his first wife's death and tried to overcome his remorse by writing poetry.

Hardy became ill with pleurisy in December 1927 and died at Max Gate just after 9 p.m. on 11 January 1928, having dictated his final poem to his wife on his deathbed; the cause of death was cited, on his death certificate, as "cardiac syncope", with "old age" given as a contributory factor. His funeral was on 16 January at Westminster Abbey, and it proved a controversial occasion because Hardy and his family and friends had wished for his body to be interred at Stinsford in the same grave as his first wife, Emma. However, his executor, Sir Sydney Carlyle Cockerell, insisted that he be placed in the abbey's famous Poets' Corner. A compromise was reached whereby his heart was buried at Stinsford with Emma, and his ashes in Poets' Corner.

Shortly after Hardy's death, the executors of his estate burnt his letters and notebooks. Twelve records survived, one of them containing notes and extracts of newspaper stories from the 1820s. Research into these provided insight into how Hardy kept track of them and how he used them in his later work. In the year of his death Mrs Hardy published The Early Life of Thomas Hardy, 1841 – 1891: compiled largely from contemporary notes, letters, diaries, and biographical memoranda, as well as from oral information in conversations extending over many years.

Hardy's work was admired by many authors including D. H. Lawrence and Virginia Woolf. In his autobiography Goodbye to All That, Robert Graves recalls meeting Hardy in Dorset in the early 1920s. Hardy received him and his new wife warmly, and was encouraging about his work.

In 1910, Hardy was awarded the Order of Merit.

Hardy's cottage at Bockhampton and Max Gate in Dorchester are owned by the National Trust.

Hardy's family was Anglican, but not especially devout. He was baptised at the age of five weeks and attended church, where his father and uncle contributed to music. However, he did not attend the local Church of England school, instead being sent to Mr Last's school, three miles away. As a young adult, he befriended Henry R. Bastow (a Plymouth Brethren man), who also worked as a pupil architect, and who was preparing for adult baptism in the Baptist Church. Hardy flirted with conversion, but decided against it. Bastow went to Australia and maintained a long correspondence with Hardy, but eventually Hardy tired of these exchanges and the correspondence ceased. This concluded Hardy's links with the Baptists.

Hardy’s idea of fate in life gave way to his philosophical struggle with God. Although Hardy’s faith remained intact, the irony and struggles of life led him to question the traditional Christian view of God. Hardy's religious life seems to have mixed agnosticism, deism, and spiritism. Once, when asked in correspondence by a clergyman about the question of reconciling the horrors of pain with the goodness of a loving God, Hardy replied,

Nevertheless, Hardy frequently conceived of and wrote about supernatural forces that control the universe, more through indifference or caprice than any firm will. Also, Hardy showed in his writing some degree of fascination with ghosts and spirits. Despite these sentiments, Hardy retained a strong emotional attachment to the Christian liturgy and church rituals, particularly as manifested in rural communities, that had been such a formative influence in his early years, and Biblical references can be found woven throughout many of Hardy's novels.

Hardy's friends during his apprenticeship to John Hicks included Horace Moule (one of the eight sons of Henry Moule) and the poet William Barnes, both ministers of religion. Moule remained a close friend of Hardy's for the rest of his life, and introduced him to new scientific findings that cast doubt on literal interpretations of the Bible, such as those of Gideon Mantell. Moule gave Hardy a copy of Mantell's book The Wonders of Geology (1848) in 1858, and Adelene Buckland has suggested that there are "compelling similarities" between the "cliffhanger" section from A Pair of Blue Eyes and Mantell's geological descriptions. It has also been suggested that the character of Henry Knight in A Pair of Blue Eyes was based on Horace Moule.