Dianne Gladys Hadden (born 4 October 1951) is an Australian politician. She was an independent member of the Victorian Legislative Council since April 2004, after resigning from the Labor Party, which she previously represented in the council for Ballarat Province since 1999.
She attempted to switch to the Victorian Legislative Assembly at the 2006 election, contesting the electorate of Ballarat East, but gained less than 7% of the vote.
Hadden was born in Ivanhoe, Melbourne, and studied economics and law at Monash University. She worked for law firms in Melbourne and Ballarat, before founding her own practice in Ballarat in 1992.
In the leadup to the 1999 state election, Hadden succeeded in securing Labor pre-selection for the Liberal-held seat of Ballarat Province. She was ultimately successful, defeating new Liberal candidate, David Clark. Though she has never occupied a ministerial position, Hadden has been a member of the Law Reform Committee since her election to parliament, and in 2003, also joined the House Committee.