C15 date, built on earlier foundations and restored 1844-5 by John Hayward.
The early church columns are of elvan (green) stone, and those in the C15 clothworkers aisle of Dartmoor granite.
The east end of the north aisle has a mid-C19 projection for an organ, and at the west end is a small round-arched C14 stoup in the wall.
The hopper heads to the tower are dated 1661.
The mid-C19 pews have elaborately carved ends, one in the south aisle having a tiny ivory church mouse set within it.
Bones, said to be those of Ordulf, founder of the Abbey are interred here, and there is an inscribed stone floor slab at the south end of the nave: ORDULF/ FOUNDER OF TAVISTOCK ABBEY/ 981.
a C14 oak iron-bound wagon chest, trapezoid in shape.
In the nave is a carved Caen stone pulpit of 1846.
Next to it, in the north aisle, is an organ and case of 1845, with carved statues of 1879, by J.W. Walker and Sons of London.
To the left of the case, in the north wall, is a sealed ogee-arched recess, probably associated with a C14 chapel to John Dabernon and his wife.
There is a variety of C19 stained glass across the church.
The north aisle east window is by Morris & Co. and features evangelists, prophets, scenes from the life of Christ, and angels playing musical instruments.
Below and to the right is an early door, probably of C14 date.
The central east window of 1949 is by James Powell of Whitefriars Glass Company, and to each side of it are tablets inscribed with the commandments placed in highly decorated Caen stone niches.
Monuments in the church include a large standing wall-monument in the north chapel to John Fytz and wife and son , with recumbent effigies on a tomb chest behind columns.
In the south chapel wall is an alabaster monument to John Glanville and wife.
There are a number of memorial tablets across the church (and exterior) including above the south door, to B. Carpenter and his family.