Robert Bentley (25 March 1821 – 24 December 1893) was an English botanist.

He is perhaps best remembered today for the four-volume Medicinal Plants, published in 1880 with Henry Trimen and containing over three hundred hand-colored plates by botanist David Blair.

While apprenticed to a pharmacist in Tunbridge Wells, he developed an interest in botany.

[1] In 1874, Bentley was elected a Fellow of the Royal Pharmaceutical Society of Great Britain, and he served as joint editor of the British Pharmacopeia of 1885.

[1] Bentley died at his home in Warwick Road, Kensington, on 24 December 1893, and was buried at Kensal Green cemetery.