Trematon is a village in Cornwall, England, UK, accessible via the A38 and about two miles (3 km) from the town of Saltash and part of the civil parish of St Stephens-by-Saltash.

Trematon appears in the Domesday Book (1086) as the manor of "Tremetone",[1] at 100 households it was one of the very largest settlements in Cornwall and West Devon, larger even than nearby St Germans.

[2] William Camden says of Trematon ...you come to the Liver, a little river stored with oisters that runneth under S. Germans, a small towne...

[3]Trematon Castle, one and a half miles south-east of the village, stands in a sentinel position overlooking Plymouth Sound and dates from soon after the Norman conquest.

[4] William Hals wrote that Caddock the son of Condor of Cornwall's "chief dwelling and place of residence was at Jutsworth, near Saltash and Trematon".