Lynn Maurice Ferguson Arnold, AO (born 27 January 1949) is an Anglican priest and a former Australian politician who represented the South Australian Branch of the Australian Labor Party, serving as Premier of South Australia between 4 September 1992 and 14 December 1993 at the end of 11 years of Labor government resulting from the 1993 election landslide.
After leaving politics, Arnold worked for World Vision from 1997 to 2007, and for Anglicare SA since March 2008. In November 2013 he was ordained a deacon in the Anglican Church. In December 2014 he was ordained priest in St Peter's Cathedral, Adelaide.
Entering in Parliament as member for Salisbury on 15 September 1979, he became a Minister with the election of the John Bannon Labor Government in 1982. He served as Minister of Education, Tertiary Education, Agriculture and State Development. Arnold held the seat of Salisbury until it was abolished on 6 December 1985, he then represented Ramsay from 7 December 1985 to 11 December 1993.