Isabel 'Joy' Bear AM (4 January 1927 – 8 April 2021) was an Australian chemist who worked at CSIRO for over forty years. She was the first woman to be awarded the Royal Australian Chemical Institute Leighton Medal. She was inducted into the Victorian Honour Roll of Women in 2005. Bear identified several metastable zirconium sulphate hydrates, and with Dick Thomas was the first to scientifically describe "petrichor", the smell of rain on dry soil.