GB Cave is a cave between Charterhouse and Shipham in the limestone of the Mendip Hills, in Somerset, England.

[2] The cave was first entered on 19 November 1939, after ten months of digging, by the University of Bristol Spelæological Society, and was named in recognition of the two members, F. J. Goddard and C. C. Barker, who had done most of the work involved in its discovery.

[2] Ladder Dig broke through in 1966 to gain access to the extremely well-decorated Bat Passage.

Together these two form what was thought to be largest known space under the Mendip Hills,[8] until the discovery of "The Frozen Deep" in Reservoir Hole in 2012.

The trace elements magnesium, strontium and barium have been found by laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) from three Holocene speleothems taken from the Great Chamber.