Grand Rapids Theological Seminary (GRTS) of Cornerstone University is a multidenominational evangelical Christian seminary located in Grand Rapids, Michigan. GRTS is an accredited member of the Association of Theological Schools in the United States and Canada, The Higher Learning Commission of the North Central Association of Colleges and Schools, and is authorized by the Michigan State Board of Education to grant advanced theological degrees.

Grand Rapids Theological Seminary had its humble beginnings as an evening Bible institute at Wealthy Street Baptist Church in 1941. The Bible institute became a degree granting institution in 1963 and moved to its present location in 1964. The institution became a Christian liberal arts college in 1972 and became a state-approved university in 1999. Today Cornerstone University and Grand Rapids Theological Seminary share a 123-acre (0.50 km2) campus four miles (6 km) east of downtown Grand Rapids, Michigan. The campus currently supports the undergraduate college, with programs for traditional students as well as accelerated degree programs, graduate programs including Grand Rapids Theological Seminary and Asia Baptist Theological Seminary based in Thailand, and Cornerstone University Radio.

Grand Rapids Theological Seminary exists primarily to advance biblical knowledge and ministry skill, to encourage the development of critical thinking and worldview formation, to nurture a global ministry perspective, and to enhance culturally relevant ministry.

Today, Cornerstone and GRTS share a 130-acre campus less than five miles from downtown Grand Rapids and operate under a single board of trustees and university president. The seminary is located in the Leon J. Wood Seminary Building, which opened in 1977, and it has its own administrative staff and faculty.