At the western end of the North Aisle of the Nave is a spacious Chapel, used every day for the celebration of the Holy Communion at eight o’clock in the morning, for a short service at mid-day (at 1.15), and for an evening service at eight o’clock. The oak panelling is that originally introduced by Sir Christopher Wren; the mosaic at the west end commemorates Archdeacon Hale, who died in 1870; the large window on the north is a memorial to Dean Mansel, Dean of the Cathedral from 1868 to 1871; the beautiful mosaic in the eastern apse is a more recent addition.

The Chapel was at first called the Morning Prayer Chapel, and was opened for use on February 1st, 1699, though the Cathedral itself was still far from completion. Here, for many years, Morning Prayers were said at an early hour: in 1699, at 6 o’clock in summer, and 7 o’clock in winter; at the present time prayers are said at 8 o’clock in the Crypt Chapel.