Florence Isabel Bjelke-Petersen (née Gilmour; 11 August 1920 – 20 December 2017) was an Australian politician and writer. She was a member of the Australian Senate from 1981 to 1993, and was the wife of the longest-serving Premier of Queensland, Sir Joh Bjelke-Petersen. She was styled as Lady Bjelke-Petersen upon her husband's knighthood, and was also known informally as Lady Flo.