Standing on the hillside in a peaceful location with views across the Bristol Channel to the Welsh Hills, is the parish church of the Holy Trinity. It is a 15th-century Perpendicular Gothic building, restored and partially rebuilt in 1847–48 after a fire. Another fire occurred in the church in 1972. By a coincidence the date was the same as the previous fire, February 21st. The consequence of this fire was not nearly so serious; the organ was destroyed and one or two pews; the roof was badly scorched.
Inside the church the oldest monument is The Norton Canopy Monument in the south aisle. Although damaged over the years it shows the Norton coat of arms. On the north wall of the chancel is the marble monument to Sir George Norton (who died in 1715) and his wife. Although she remarried, it is thought she was the only resident of Abbots Leigh to be buried in Westminster Abbey, London. The Trenchards are commemorated by two plaques in the chancel and around the walls are monuments, plaques and tablets to village notables – Philip John Miles, the Brights, the Miles and many others.
During the 1914-1918 war men from the village enlisted, not all returned. A Roll of Honour is on the north wall, and the churchyard cross was restored as a war memorial.
The tower has six bells, three of which were cast in 1781 by William Bilbie of the Bilbie family.
Within the upper churchyard is an ancient yew believed to be over 800 years old. There are two graveyards, the upper one with many of the older graves of the village, the oldest legible grave being 1699, with the lower graveyard holding graves of many dating from the twentieth century. Maps of both graveyards mark the burial places of some four hundred villagers, although there are probably over five hundred graves as a number of these are hidden beneath the ground. In the churchyard the octagonal stone steps supporting the War Memorial are thought originally to have been the base of an early Preaching Cross. There is an ancient font beside the South porch which may have been used for christenings from the earliest days of the church, until replaced by the existing one which is 19th century.