Ryan Oliver Sampson is an English actor best known for playing Grumio in the British sitcom Plebs, for various roles in the comedy sketch show Glitchy, and for his appearances in After You've Gone, in which he plays Alex, son of Jimmy Venables (Nicholas Lyndhurst).
In 2008 he appeared as Luke Rattigan in two episodes of Doctor Who, "The Sontaran Stratagem" and "The Poison Sky".
He had been a main cast member of the seventh series of the 2015 Horrible Histories reboot from 2017 to 2018, but did not appear for the show's 8th series which premiered on June 2019.