William Duncan Oswald (born 1936) has been a counselor to A. Roger Merrill in the general presidency of the Sunday School of The Church of Jesus Christ of Latter-day Saints (LDS Church) since 2004. Oswald was also a counselor in the same organization to Russell M. Nelson in 1978 and 1979.
Oswald was born in Salt Lake City, Utah. He served as an LDS Church missionary in England and Scotland. Oswald obtained a law degree from the University of Utah and worked as an attorney in Salt Lake City.
Oswald served as a bishop in Salt Lake City, and at one point was the bishop of Church President Spencer W. Kimball. In the 1980s, Oswald was a Regional Representative of the Twelve Apostles. In 2001 to 2004, Oswald presided over the Russia Vladivostok Mission of the church.
Oswald was the second counselor to the General Superintendent of the Sunday School, Russell M. Nelson, in 1978 and 1979. He also briefly served as Nelson's first counselor in 1979. Oswald was asked in 2004 to return to the Sunday School as the second counselor to A. Roger Merrill.