The Bracklesham Group (formerly Bracklesham Beds), in geology, is a series of clays and marls, with sandy and lignitic beds, in the middle Eocene of the Hampshire Basin and London Basin of England.

[1] The type section of the Bracklesham Group is the sea cliffs at Whitecliff Bay on the Isle of Wight, and it is also well developed on the mainland.

The Bracklesham Group lies between the Barton Clay above and the Bournemouth Beds,[citation needed] Lower Bagshot, below.

In the London Basin, these beds are represented only by thin sandy clays in the Middle Bagshot group.

In the Paris Basin the "Calcaire grossier" lies upon the same geological horizon.