Raymond David Grant, 11th Baron de Longueuil (1924 – 6 October 2004) was a nobleman possessing the only French colonial title to be officially recognized by the British Crown.

Raymond had one son, Michael Charles Grant (who inherited his title), and four grandchildren: Angela, Rachel, Rebecca and David.

He spent most of his life as an artist, painting under the name of "Raymond de Longueuil", capturing the final years of traditional farming in the Bearn.

June 2008 marked the official inauguration of "Passage Raymond de Longueuil l" - the naming of an old, historic street at the king's lieutenant's grounds in the centre of Navarrenx, in remembrance of the acclaimed local artist.

Included in the unveiling was an exhibition opening of unique works by Raymond de Longueuil held at the former residence of the king's lieutenant.