The Sovereign Grace Advent Testimony (SGAT) is a Protestant and Reformed Christian organisation begun in 1918 in the United Kingdom. It holds to a manifesto agreed in 1919.
SGAT's stated purpose is the promotion and diffusion of the faith, being the doctrine of God's sovereign grace in the matter of man's salvation, and the truth of the second advent of the Lord Jesus Christ.
The Sovereign Grace Advent Testimony publish books by authors such as Benjamin Wills Newton, George Muller, Samuel Prideaux Tregelles and Charles Haddon Spurgeon. Regular monthly meetings are held at New Life Bible Presbyterian Church in West Kilburn, London, including two conferences, in the Spring and Autumn.