St. John's Church is a historic A.U.M.P. Church located in Ruxton, Baltimore County, Maryland. It was built in 1886 as a successor to the original log cabin church built on the site in 1833, and is a frame Carpenter Gothic-style gable-roofed structure with board-and-batten siding, stylized lancet windows and decorative detailing. Also on the property is a 11⁄2-story stuccoed stone house, believed to date from about 1835, which was used as a parsonage and has suffered significant fire damage, and a simple frame rectangular social hall built about 1890. The African American congregation that constructed this church was formed in the 1830s and they acquired this site in 1833. According to its National Register listing, "St. John's Church is particularly important as an exceptional example of African American church building in the late 19th century." 
There is an extensive burial ground behind the church.