Susan Elizabeth Close is an Australian politician, who is currently the deputy premier of South Australia since March 2022. She also holds the ministerial portfolios of Minister for Climate, Environment and Water ; Minister for Industry, Innovation and Science; and Minister for Defence and Space Industries.

The deputy premier of South Australia is the second-most senior officer in the Government of South Australia. The deputy premiership is a ministerial portfolio in the Cabinet of South Australia, and the deputy premier is appointed by the governor on the advice of the premier of South Australia.