The Union Chapel, now known as St. Andrew's Episcopal Church, is a historic church located near Glenwood, Howard County, Maryland, United States. It is a rectangular two-story building of stuccoed stone construction completed in 1833. To the rear of the chapel is the attractively landscaped non-sectarian Oak Grove Cemetery. Charles D. Warfield, a member of a prominent Maryland family of the same surname that settled this region, deeded the property to the residents of the area for non-denominational church and community use. The chapel is closely associated with the Methodist church.