Gunn was born on December 25, 1973, in Ontario, Canada, into an Irish Traveller family from the Republic of Ireland and the United Kingdom.

Gunn would make a name for himself in the Canadian amateur scene. He had a successful amateur career that spanned seven years. Gunn made his professional boxing debut on April 28, 1989, Tucson, Arizona, winning by unanimous decision over Richard Palmer. In his third pro bout, Gunn stopped future titlist Quirino Garcia in the third round. He would go on to win eight of his next ten fights, before an 11-year hiatus from professional boxing, although he did compete in more than 60 bare-knuckle bouts.

He resurfaced in 2004 and knocked out four straight foes before competing in one of the most notorious matches of the last decade. Gunn came back in 2017 in a fight against Roy Jones Jr but was stopped in the eighth round.

Gunn then put together a solid six-bout unbeaten streak, including a third round stoppage in a rematch against Gross, where he won three different titles. He once again found himself in the limelight on July 11, 2009, when he challenged Ring Magazine and International Boxing Federation champion Tomasz Adamek. Although he was a big underdog against the pound for pound rated Adamek, Gunn hung in tough and had moments of success, but his night was once again cut short. Although the referee admitted after the bout he would have let him continue, ringside physician decided Gunn had taken too many clean punches and stopped the bout following the fourth round.

Bobby Gunn has bare-knuckle boxing record 73 - 0 ( 73 wins and 0 loss ).

On Friday, August 5, 2011, Gunn fought Richard Stewart in the first sanctioned bareknuckle boxing match since 1999.^[1][2] Gunn defeated Stewart with a KO in round 3, winning the vacant heavyweight bareknuckle boxing title. Four months later, Gunn defended his bareknuckle crown, stopping Ernest Jackson in less than nine minutes.

• Bare-knuckle boxing Heavyweight Lineal World Title 2011
• Bare-knuckle boxing Heavyweight World Title 2011 - Recognized by Yavapai Nation
• Bare - knuckle boxing Heavyweight World Title 2015 - Recognized by Bare Knuckle Boxing Hall of Fame
• Bare-knuckle boxing Heavyweight World Title 2016 - Recognized by National Police Gazette

• Makinde, Adeyinka (2010). Boxing now and then. iUniverse Publishers. ISBN 978-1-4502-0637-2.

• Boxing record for Bobby Gunn from BoxRec (registration required)