Samuel Barclay Beckett (/ˈbɛkɪt/ ^ⓘ; 13 April 1906 – 22 December 1989) was an Irish playwright, poet, novelist, and literary critic. Writing in both English and French, his literary and theatrical works feature bleak, impersonal, and tragicomic episodes of life, coupled with black comedy and literary nonsense. Beckett is widely regarded as one of the most influential and important writers of the 20th century, credited with transforming modern theatre. As a major figure of Irish literature, he is best known for his tragicomedy play Waiting for Godot (1953). For his foundational contribution to both literature and theatre, Beckett received the 1969 Nobel Prize in Literature, "for his writing, which—in new forms for the novel and drama—in the destitution of modern man acquires its elevation."

During his early career, Beckett worked as a literary critic and commentator, and in 1930 he took up a role as a lecturer in Dublin. He wrote his first novel Dream of Fair to Middling Women in 1932, which influenced many of his later works, but it was not published until after his death. Around this time, Beckett also began studying artistic expressions and art history, particularly of paintings displayed at the National Gallery of Ireland. He maintained a close friendship with Irish writer James Joyce throughout his life, and cited him as a major inspiration for his works. As a resident of Paris for most of his adult life, Beckett wrote in both French and English, sometimes under the pseudonym Andrew Belis. His later literary works, especially his plays, became increasingly austere and minimalistic as his career progressed, involving more aesthetic and linguistic experimentation, with techniques of stream of consciousness repetition and self-reference. During the Second World War, Beckett became a member of the French Resistance group Gloria SMH (Réseau Gloria) and was awarded the Croix de Guerre in 1949.

His works were well received by critics and theatre audiences during his own lifetime, and his career spanned both Ireland and France, with short stints in Germany and Italy. During these terms, Beckett collaborated with many actors, actresses and theatre directors for his plays, including Jack MacGowran, Billie Whitelaw, Jocelyn Herbert, and Walter Asmus. Beckett's works are known for their existential themes, and these made them an important part of 20th-century plays and dramas. In 1961, he shared the inaugural Prix International with Jorge Luis Borges. He was also the first Saoi of the Aosdána, having been elected to the position in 1984.

Beckett is considered to be one of the last modernist writers and a key figure in what Martin Esslin called the "Theatre of the Absurd." He died in 1989 and was buried at the Cimetière du Montparnasse. His most well-known play, Waiting for Godot, has since become a centrepiece of modernist literature, and in a public poll conducted by London's Royal National Theatre in 1998, it was voted as "the most significant English-language play of the 20th century."

Samuel Barclay Beckett was born in the Dublin suburb of Foxrock on 13 April 1906, the son of William Frank Beckett (1871–1933), a quantity surveyor of Huguenot descent, and Maria Jones Roe, a nurse. His parents were both 35 when he was born, and had married in 1901. Beckett had one elder brother named Frank Edward (1902–1954). At the age of five, he attended a local playschool in Dublin, where he started to learn music, and then moved to Earlsfort House School near Harcourt Street in Dublin. The Becketts were members of the Church of Ireland; raised as an Anglican, Beckett later became agnostic, a perspective which informed his writing.

Beckett's family home, Cooldrinagh, was a large house and garden complete with a tennis court built in 1903 by Beckett's father. The house and garden, its surrounding countryside where he often went walking with his father, the nearby Leopardstown Racecourse, the Foxrock railway station, and Harcourt Street station would all feature in his prose and plays.

Around 1919 or 1920, he went to Portora Royal School in Enniskillen, which Oscar Wilde had also attended. He left in 1923 and entered Trinity College Dublin, where he studied modern literature and Romance languages, and received his bachelor's degree in 1927. A natural athlete, he excelled at cricket as a left-handed batsman and a left-arm medium-pace bowler. Later, he played for Dublin University and played two first-class games against Northamptonshire. As a result, he became the only Nobel literature laureate to have played first-class cricket and thus to appear in Wisden.

Beckett studied French, Italian, and English at Trinity College Dublin from 1923 to 1927 (one of his tutors – not a teaching role in TCD – was the Berkeley scholar A. A. Luce, who introduced him to the work of Henri Bergson). He was elected a Scholar in Modern Languages in 1926. Beckett graduated with a BA and, after teaching briefly at Campbell College in Belfast, took up the post of lecteur d'anglais at the École Normale Supérieure in Paris from November 1928 to 1930. While there, he was introduced to Irish author James Joyce by Thomas MacGreevy, a poet and close confidant of Beckett who also worked there. This meeting had a profound effect on the young man. Beckett assisted Joyce in various ways, one of which was research towards the book that became Finnegans Wake.