Sir Alexander Charles Onslow Fergusson (8 April 1949 – 31 July 2018) was a Scottish politician and farmer who served as Presiding Officer of the Scottish Parliament from 2007 to 2011. A member of the Scottish Conservative Party, he was Member of the Scottish Parliament (MSP) from 1999 to 2016.
Born in rural Wigtownshire, Fergusson was educated at Eton College before attending the Scottish Agricultural College at Auchincruive.