Baron St Just, of St Just in Penwith, County of Cornwall, was a title in the Peerage of the United Kingdom.
[1] It was created in 1935 for the banker Edward Grenfell.
He was the son of Henry Grenfell, the grandson of Charles Grenfell, the great-grandson of Pascoe Grenfell and the first cousin of William Grenfell, 1st Baron Desborough.
The title became extinct upon the death of his son, the second Baron, in 1984.