St Etheldreda's Church is in Ely Place, off Charterhouse Street in Holborn, London. The Roman Catholic church is dedicated to Æthelthryth, or Etheldreda, the Anglo-Saxon saint who founded the monastery at Ely in 673. In the 17th century it served as an embassy chapel for English Catholics, It was the chapel of the London residence of the Bishops of Ely.
It is one of the oldest Catholic churches in England, and one of two surviving buildings in London dating from Edward I's reign. The chapel was purchased by the Catholic Church in 1874 and opened in 1878.
St Etheldreda's consists of a chapel, or upper church, and a crypt or undercroft and is active and used for Masses, baptisms, weddings, and funerals. Because Etheldreda was often invoked for help with infections of the throat, the Blessing of the Throats is held annually at the chapel.