Sir Alexander Charles Onslow Fergusson (8 April 1949 – 31 July 2018) was a Scottish politician. He was a member of the Scottish Conservative and Unionist Party and Scottish Parliament from 1999 to 2016. He was the third Presiding Officer of the Scottish Parliament from 2007 until 2011.
Fergusson died on 31 July 2018, aged 69.