Theresa Penelope "Terri" Irwin AM is an American-Australian naturalist and author, and the owner of Australia Zoo in Beerwah, Queensland. She is the widow of naturalist and television personality Steve Irwin. Terri Irwin co-starred with her husband on The Crocodile Hunter, their unconventional television nature documentary series and its spin-off series, Croc Files and The Crocodile Hunter Diaries. She has lived in Australia since 1992, when she married Irwin.

In 1991, while visiting wildlife rehabilitation facilities in Australia, Terri met wildlife expert Steve Irwin. They married less than a year later and filmed their first television documentary while on their honeymoon. The couple settled in Australia, where Irwin owned the Australia Zoo, and soon starred in their own popular wildlife adventure series, The Crocodile Hunter. The show spotlighted Steve's talent for working with deadly creatures and led to two spinoffs, The Crocodile Hunter Diaries and Croc Files. In 2002, the Irwins released a feature film, The Crocodile Hunter: Collision Course.

On September 4, 2006, while filming an underwater documentary in Queensland, Steve Irwin died after sustaining chest and heart injuries from a short-tail stingray barb. Terri and their children, Bindi and Robert, were reportedly trekking in Cradle Mountain, Tasmania, at the time of the incident. She held a public memorial service for him at the Australia Zoo in Queensland on September 20.

Terri and her daughter currently host Planet's Best With Terri and Bindi on the Animal Planet network. Bindi, who shares her father's fearlessness and on-camera talent, also hosts *Bindi: The Jungle Girl for Discovery Kids. Terri was made an honorary Member of the Order of Australia for services to wildlife conservation and the tourism industry in 2006.

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