Andrew Geddes Bain (baptised 11 June 1797 – 20 October 1864), was a Cape Colony geologist, road engineer, palaeontologist and explorer.

In 1825 he accompanied John Burner Biddulph on a trading expedition to Kuruman, the mission outpost on the edge of the Kalahari and home of Dr. Robert Moffat (father-in-law of David Livingstone).

During these journeys he discovered his talent for drawing and writing and became a regular correspondent for John Fairbairn's South African Commercial Advertiser.

In 1834 he made another trip to Bechuanaland where he lost his wagons and collection of zoological specimens during an attack by the Matabele, caused by his Griqua guides' stealing some of the King's cattle.

He was the first man to attempt to build a road across the Limiet Mountains into the interior for which feat he was presented with table silver and a candelabrum by grateful colonists.

He was friendly with William Guybon Atherstone, who was also a keen geologist and fossil collector and who happened to be present at the discovery of Paranthodon africanus Broom at the farm Dassieklip on the Bushmans River, being about half-way between Grahamstown and Port Elizabeth.

His health at this time deteriorated markedly and he returned to South Africa; he died in Cape Town following a heart attack on 20 October 1864.

While resident in Grahamstown he wrote some satirical sketches for local amateur dramatic entertainment and invented the character Caatje Kekelbek or Life Among the Hottentots (1838), also known as Kaatje Kekkelbek (Katie Gossip) who endeared herself forever to South Africans, and held John Philip and other missionaries up to ridicule.