The Annunciation Church in Denver, Colorado is an historic church at 3601 Humboldt Street. It is part of the Roman Catholic Archdiocese of Denver. The structure was built during 1904 to 1907 and was added to the National Register in 1990. It is built with red brick walls with white cut stone trim. It has elements of Romanesque Revival and Gothic Revival architecture. A planned steeple and bell tower were never built, so its highest point is its cross on the roof's peak. It included stained glass from in Munich, Germany. Its main altar is Carrara marble from Italy.