Alastair S. Robinson (born 1980) is a British-American taxonomist and field botanist specialising in the carnivorous plant genus Nepenthes. Robinson published the first paleogeographical evidence for the radiative speciation of an enigmatic group of ultramafic Philippine and Malaysian Nepenthes from a common ancestor on the island of Borneo.
In 2007, Robinson co-discovered the giant Palawan pitcher plant, Nepenthes attenboroughii, for which he authored the formal description and diagnosis. This species was the largest-pitchered Nepenthes discovered since the identification of Nepenthes rajah on Borneo in 1858. Other discoveries resulting from his ongoing work in Palawan include the first records of the orchid genus Stigmatodactylus in the Philippines, with two new species, Stigmatodactylus aquamarinus A.S.Rob. & E.Gironella and Stigmatodactylus dalagangpalawanicum A.S.Rob., described from Palawan in 2016.
A slipper orchid endemic to Sulawesi, Indonesia, was commemoratively named Paphiopedilum robinsonianum after this authority following its discovery in 2013.