Montague Waldegrave, 5th Baron Radstock (15 July 1867 – 17 September 1953) was the second son of Granville Waldegrave, 3rd Baron Radstock and his wife, Susan Charlotte Calcroft.
Radstock was educated at Monkton Combe School and Trinity College, Cambridge, graduating with a BA degree in 1889.
When his elder brother the 4th baron died without issue in 1937, he succeeded to the title of Baron Radstock of Castle Town, Queen's County, Ireland.
Radstock married Constance Marion Brodie on 15 July 1898. They had three daughters and a son:[1]
Radstock's only son, John, was killed in action in 1944 whilst on active service aboard, leaving behind two daughters. With no remaining male heirs, the barony became extinct on the death of the 5th baron at the age of 86 in 1953.
| Escutcheon: | Per pale Argent and Gules a crescent Sable for difference. |
| Crest: | Out of a ducal coronet Or a plum of five ostrich feathers per pale Argent and Gules a crescent Sable for difference. |
| Supporters: | Dexter a talbot reguardant wings expanded and elevated holding in the dexter claw a thunderbolt all Proper. |
| Motto: | St Vincent[2] |