Hunt was recruited from Parkdale by Richmond and made his debut in the then Victorian Football League in 1968. He was a key position player who was usually positioned at full-forward or centre half-forward. Later he played at centre half-back. He was part of Richmond’s premiership sides in 1969 and 1973. In the middle of 1974, Hunt moved to the Geelong Football Club due to his work as a policeman. The big strong forward played at Geelong in 1974 and 1975, playing only 32 games for the club before moving back to the city and playing with St Kilda. He retired from VFL football at the end of 1978 but continued to play in the lower-level VFA in 1980 and 1981 with Sandringham. He won the Frosty Miller Medal for kicking 110 goals in 1981.

Hunt was born in Mentone, Victoria, and attended Mordialloc High School. He joined the police force as a cadet after leaving school. In 1970 he was called up to national service.

In 1981 Hunt was giving regular radio fishing reports and had made two videos on the subject. His first television fishing show was Angling Action on the Ten Network. Two series of 13 episodes were made and were shown in 1981 and 1982 respectively. His 3DB radio fishing show began in 1982. Throughout the 1980s, Hunt continued to write for a number of newspapers and magazines. In 1991 a series of Rex Hunt’s Fishing World was made and broadcast in Victoria on Channel Seven. A new and longer series of the show went national as Rex Hunt’s Fishing Australia the following year. In 1992, the name changed again to Rex Hunt’s Fishing Adventure, which remained on air until 2004. He also had a show on radio 1116 SEN hosting a fishing program ‘Off The Hook’ with son in law Lee Raynor.

In May 2004, Hunt made a curious attempt to make a statement about airline security, which has been markedly increased in Australia after terrorist threats. Hunt was agitated at having to remove his pants and footwear after setting off a metal detector. He then took ten metal forks from the Qantas Club and took them on board a Qantas flight from Adelaide headed for Melbourne in an attempt to prove that airport security was totally flawed. A concerned passenger who did not recognise Hunt alerted the flight crew and he was detained on arrival in Melbourne, where he was questioned for approximately 30 minutes and let go without any charges filed against him.

Hunt was involved in a controversial incident involving a racial slur in 2005, when he called Collingwood’s Leon Davis, who is of Aboriginal descent, ‘as black as a dog’ during the call against Essendon mid-way through the season. Hunt made the comment when he trailed off while saying “Neon Leon hasn’t lit up tonight; he’s as black as a dog’s guts in the night”, to describe Davis’ poor form in that match in terms of a neon lights metaphor; other members of the commentary team had been using different neon lights metaphors in the same context. Hunt’s apology to Davis was initially rejected, and only accepted later in the week after a face-to-face meeting.

In 2005, Hunt and his son were involved in an incident in Byron Bay where he claimed to have been attacked by local teenagers. The teenagers involved, however, claim Hunt was extremely intoxicated at the time and his son had thrown the first punch.

On 17 May 2006 News Ltd exposed Hunt’s 15 years of secret sexual liaisons. When confronted Hunt confessed he had paid three women in succession for ongoing sexual relationships over a period of more than 15 years. The final relationship, with a beautician in her 30s, began in 1997 and cost Hunt $1000 a week. Hunt acknowledged he is a hypocrite given his repeated attacks on other media personalities for sexual infidelity. Hunt followed this by an interview with radio broadcaster Neil Mitchell on Melbourne radio 3AW. A quote from Rex Hunt’s radio comments,

After his retirement as a player, Hunt became a popular football commentator for 3AW. He also hosted Sunday morning panel shows on the Seven Network, the Sportsworld Footy Panel and I’m Rex Hunt and You’re Not. Early in the 2007 season, Rex celebrated his 1500th game as a commentator of VFL/AFL games. . Hunt announced his resignation from 3AW to join Triple M on 17 November 2009 Hunt announced his retirement from mainstream metropolitan commentary in 2011, however he continues as a commentator for Crocmedia’s AFL coverage, calling alongside Peter Donegan. In 2015, Hunt called his 2,000th game of AFL football

In April 2014, Hunt started a new radio show on SEN 1116 called ‘This Is Your Football Life’ exploring the lives and achievements of various AFL/AFL football legends. The show is produced by Crocmedia and airs on Sunday mornings.

In 2017, Hunt returned to 3AW as host of a new post-match talkback program. After Richmond advanced to a preliminary final against the GWS Giants, Hunt also commentated on a Richmond-centeric “Tiger Radio” broadcast on AFL Nation with fellow Tiger legends Dale Weightman and Tony Jewell.