Shane William Desmond Alexander, 2nd Earl Alexander of Tunis (born 30 June 1935), styled Lord Rideau between 1952 and 1969, is a British hereditary peer.
Alexander served as a Lord-in-waiting from 8 January 1974 until 4 March 1974, at the end of Edward Heath's premiership.
As a male line descendant of the Earls of Caledon, he is also in the remainder to that title and was the heir presumptive from 1980 to 1990.
Alexander married firstly Hilary van Geest on 14 July 1971.
They have two daughters:[citation needed] As Alexander has no son, the heir presumptive to the earldom is his younger brother, the Honourable Brian James Alexander, CMG (born 1939).