Holy Trinity Church, regarded as the largest military or garrison church in Southern India, is a historical landmark of Bangalore. Located east of the Parade Grounds and Richmond Road towards the Cavalry Barracks, it was built in 1848-51 for the British Regiment stationed in Bangalore. After Independence, the church was taken over by the Christian Indian Military personnel and became part of the Church of South India (CSI). Now it is under the Karnataka Central Diocese.

Holy Trinity church is a majestic piece of architectural grandeur. The walls are lined with ornate marble murals and tablets. The wooden carved pairs of angels on the roof above the choir pews and the altar, baptismal pond at the entrance, stained glass which depicts the baptism of Jesus in splendid colour are worth seeing.