The Irish Society Window was added to the north transept in 1862. The Irish Society has an association with Coleraine and St. Patrick's going back to the early 1600s. The town was granted to the Society by James 1 under the terms of the Plantation of Ulster. The Society developed the town (whose layout still corresponds to the 17th century plan) and the church. The Society nominated the rectors of St. Patrick's until the Disestablishment of the Church of Ireland, which came into effect in 1871. The Irish Society maintains its link with St.

The Thomas Gallagher Memorial Tablet records the heroic but sad story of a Coleraine Inst. pupil who, along with up to 100 other boarders from the school, used to sit in this part of the church. "Thou knowest not what a day may bring forth".

Marks on the outside of this wall shows where a cannon ball and shot hit the old wall of the church in a distant conflict, possibly the siege of Coleraine (1641).

The Chancel was modified in the renovation work of 1995-1996. The floor area was enlarged and removable communion rails installed to provide more space and greater flexibility. The height of the floor was also raised to give greater visibility. The chancel walls are made of red dressed Ballycastle freestone.

The Henry Stewart O'Hara Memorial Tablet summarises this man's very significant ministry.

The Reredos, the intricately carved stonework behind the Communion Table, portrays aspects of the Person and Work of Christ. The first televised Anglican Communion Service from an Irish church took place here in December 1962 under the direction of Canon W.J.R. Benson (Rector 1962-1977).