Hugh John Wirth AM[2] (9 September 1939 – 5 February 2018) was an Australian veterinarian and animal welfare advocate in Victoria, Australia.

[2] Wirth joined the RSPCA as a junior member in 1948, trained in veterinary science and practised as a veterinarian for 47 years, and became one of Australia's best known and outspoken animal welfare advocates.

On the live export trade Wirth was a staunch opponent arguing "that the animal is killed in an Australian abattoir.

"[6] Similarly, Wirth opposed duck hunting calling it cruel and unnecessary and no longer an acceptable cultural practice for Victorians.

[9] In 1988, Wirth was the first Australian to receive the George T. Angell Humanitarian Award from the Massachusetts Society for the Prevention of Cruelty to Animals (MSPCA).