Brianna Beahan (born 1 November 1991) is an Australian track and field athlete who specializes in the 100 metres hurdles. She won a gold medal in 100 metres hurdles at the 2019 Oceania Athletics Championships in Townsville. Representing Australia at the 2019 World Athletics Championships, she reached the semi-finals in women's 100 metres hurdles.
Beahan was born in Joondalup, and is educated at the Edith Cowan University in Perth, Western Australia.