Hetty Margarete Johnston, AM (born 27 September 1958), is the Founder and Executive Director of Bravehearts Inc., an organisation advocating for better child protection in Australia. She is a lobbyist, who often highlights and promotes action against pedophilia within media, families, schools and in the general community. She declared in September 2012 a desire "to make Australia the safest place in the world for children".
Johnston has published a book detailing her beliefs called In the Best Interests of the Child. Hetty Johnston has been named the Queensland Australian of the Year 2015.
In 2004 Hetty Johnston unsuccessfully stood for a QueenslandSenate seat in the federal election. In October 2015, she announced her intention to run for mayor of Logan city in the 2016 election. She withdrew in December 2015, citing an inability to commit to the heavy schedule required, and the need to focus more on her family.