Dahlgren Chapel of the Sacred Heart, often shortened to Dahlgren Chapel, is a Roman Catholic chapel located in Dahlgren Quadrangle on the main campus of Georgetown University in Washington, D.C. The chapel was built in 1893, and is located in the historic center of the campus.

A chapel is a Christian place of prayer and worship that is usually relatively small. The term has several meanings. First, smaller spaces inside a church that have their own altar are often called chapels; the Lady chapel is a common type of these. Second, a chapel is a place of worship, sometimes interfaith, that is part of a building, complex, or vessel with some other main purpose, such as a school, college, hospital, palace or large aristocratic house, castle, barracks, prison, funeral home, cemetery, airport, or a military or commercial ship. Third, chapels are small places of worship, built as satellite sites by a church or monastery, for example in remote areas; these are often called a chapel of ease. A feature of all these types is that often no clergy were permanently resident or specifically attached to the chapel.