Marie Therese Tehan (née O'Brien; 19 June 1940 – 31 October 2004) was an Australian politician and lawyer. Educated at Sacré Cœur School, Glen Iris, Melbourne and at the University of Melbourne, Marie O'Brien qualified as a lawyer. She married James "Jim" Tehan in 1963 and settled in regional Victoria. They had six children—including Dan Tehan, the current federal member for Wannon, elected in the 2010 federal election. She established her own legal practice in Mansfield in 1970. Tehan died on 31 October 2004, at Nagambie, Victoria, aged 64, due to Creutzfeldt-Jakob disease (CJD).