| The Three Brothers of Grugith | |
| Map Type: | Cornwall |
| Location: | Near St Keverne, Cornwall |
| Coordinates: | 50.0361°N -5.1271°W |
| Gbgridref: | SW 762 198 |
| Designation1: | Scheduled monument |
| Designation1 Number: | 1006746 |
| Designation1 Date: | 10 August 1923 |
The Three Brothers of Grugith (Cornish: Cornish: An Tri Broder a Grugwydh)[1] is a prehistoric site, a dolmen of the Neolithic Age, near St Keverne in Cornwall, England. It is a scheduled monument.
The dolmen is situated near the summit of a hill overlooking Goonhilly Downs. Two orthostats support a capstone; there are depressions on the capstone which may be cup marks, or may be naturally formed.
The chamber enclosed by the stones measures about 4by, height about . William Copeland Borlase excavated the chamber in 1872: he discovered a pit about deep, and one flint flake.