Thomas Chalmers (March 17, 1780 – May 31, 1847) was a prominent Scottish theologian, minister, and social reformer. Born in Anstruther, Fife, he studied at the University of St Andrews and became a key leader in the Church of Scotland. Known for his parish work in Glasgow, he focused on improving the lives of the urban poor and led the Disruption of 1843, which established the Free Church of Scotland. He advocated for education, moral reform, and church independence, leaving a lasting impact on Scottish society and religion.