Yvonne Marie Hervey, Marchioness of Bristol (née Sutton) (born 1945), also known as Lady Bristol, is a British aristocrat. She is the widow of Victor Hervey, 6th Marquess of Bristol and the mother of the incumbent Frederick Hervey, 8th Marquess of Bristol as well as Lady Victoria Hervey and Lady Isabella Hervey.
Sutton grew up in Farnborough, Kent. She was the third wife of the 6th Marquess, marrying in 1974. She moved with the Marquess to Monaco as tax exiles in the late 1970s. She became stepmother to the Marquess's two eldest children, but had a difficult relationship with them, particularly the elder John.
By the 2000s, the Marchioness was dividing her time between Monaco and Britain, visiting the latter frequently. In 2010, with help from her son, she arranged for her late husband to be reburied in Ickworth Church alongside the other late marquesses. She has helped author Michael De-la-Noy with research into the Hervey family. She has lived on the Grosvenor Estate, Mayfair.