Roy Hendry Thomson KStJ (27 August 1932 – 29 November 2009) was a Scottish businessman, public servant and political activist, based in Aberdeen.
Thomson attended Aberdeen Grammar School and gained an MA in psychology from the University of Aberdeen in 1955, later joining the British Psychological Society.
He was a Knight of the Order of St John and a deputy lieutenant of Aberdeen until August 2007.
He also acted as the election agent for Malcolm Bruce MP in the Gordon constituency in 1979 and 1983.
He was also active within the Party nationally, serving as both Convener (chairman) and later President of the Scottish Liberal Democrats.