Steve Biddulph (born Saltburn, England 1953) is an Australian author, activist and psychologist who has written a number of influential bestselling books and now lectures worldwide on parenting, and boys' education.
He is one of a group of child development specialists in the UK and elsewhere who argued successfully for the introduction of parental leave in that country, and cautioned on the dangers of institutional daycare for the under twos.
He also campaigned on Australia's mistreatment of refugee parents and children under the Howard Government, and led and funded a five year project to create a permanent national memorial to the SIEV X sinking in Canberra. This memorial involving over a thousand student and community artists, was dedicated in October 2007.
With his wife and co-author Shaaron Biddulph he sponsors a number of activist organizations, and environmental causes. Biddulph was voted Australian Father of the Year in 2000 for his work encouraging the active role of fathers. He lives in Tasmania, Australia.