Sir Thomas More (7 February 1478 – 6 July 1535), venerated by Roman Catholics as Saint Thomas More, was an English lawyer, social philosopher, author, statesman and noted Renaissance humanist. He was also a councillor to Henry VIII and Lord Chancellor from October 1529 to 16 May 1532.

More opposed the Protestant Reformation, in particular the theology of Martin Luther and William Tyndale. He also wrote Utopia, published in 1516, about the political system of an ideal and imaginary island nation. More opposed the King's separation from the Catholic Church, refusing to accept him as Supreme Head of the Church of England, and what he saw as Henry's bigamous marriage to Anne Boleyn. Tried for treason, More was convicted and beheaded.

Pope Pius XI canonised More in 1935 as a martyr of the schism that separated the Church of England from Rome; Pope John Paul II in 2000 declared him the "heavenly Patron of Statesmen and Politicians". Since 1980, the Church of England has remembered More liturgically as a Reformation martyr. He was honoured by the Soviet Union because of the Communist attitude to property in Utopia.