Catherine Ann Warner AC FAAL (born 14 July 1948) is an Australian lawyer and legal academic who was the 28th Governor of Tasmania from 2014 to 2021.

Warner was born Catherine Ann Friend in Hobart, Tasmania, and attended St Michael's Collegiate School and the University of Tasmania, where she graduated with a Bachelor of Laws with Honours on 15 April 1970, and with a Master of Laws by research thesis on 7 December 1978.

Following completion of her master's thesis in 1978, she commenced her lengthy career as an academic at the University of Tasmania Law School.

Warner is an internationally recognised expert in the fields of criminal law, criminology and sentencing and has taught, researched and published in these areas for more than 30 years.

[4] On 26 September 2019, Hodgman announced that the Queen had approved his request to extend Warner's term by a year, ending 19 December 2020.