The 1930 New South Wales state election was held on 25 October 1930. The election was conducted in single member constituencies with compulsory preferential voting. The election occurred at the height of the Great Depression and was a landslide victory for the expansionary monetary policies of Jack Lang.

John Thomas Lang, usually referred to as J. T. Lang during his career and familiarly known as "Jack" and nicknamed "The Big Fella", was an Australian politician, mainly for the New South Wales Branch of the Labor Party. He twice served as the 23rd Premier of New South Wales from 1925 to 1927 and again from 1930 to 1932. He was dismissed by the Governor of New South Wales, Sir Philip Game, at the climax of the 1932 constitutional crisis and resoundingly lost the resulting election and subsequent elections as Leader of the Opposition. He later formed Lang Labor that contested federal and state elections and was briefly a member of the Australian House of Representatives.