The WSW World Heavyweight Championship is a professional wrestling world championship contested for in the heavyweight division of World Series Wrestling (WSW).

On 5 October 2005, during WSW's first show, Rhino became the inaugural champion by defeating Jeff Jarrett, during a tour that took part in Melbourne, Victoria.^[1] Rhino held the championship for three days before losing it to Jarrett on 8 October.^[2] On 1 May 2007, due to Jarrett's commitments with Total Nonstop Action (TNA), WSW stippred him of the championship.^[2] on 1 June, Bryan Danielson won the vacant championship by defeating Nigel McGuinness.^[2]

On 31 August 2007, the championship was deactivated as WSW went to hiatus. Ten years later, on 25 November 2017, Ricochet won the now reactivated championship after defeating Austin Aries and Brian Cage in a three-way match.^[3] In 2019, the championship was vacated with the previous titleholder being Marty Scurll.^{[4][citation needed]} On 8 July 2022, Johnny Downunder won the vacant championship after defeating Joey Janela in a no disqualification match.^[5] Downunder has previously won the title under the ring name Johnny Impact.^[6]

As of 8 May 2024, there have been 15 reigns between 12 wrestlers and two vacancies. Rhino was the inaugural champion. Austin Aries, Johnny Downunder (also known as Johnny Impact) and Matt Cardona, share the record for most reigns at two. Aries is the oldest champion at 40 years old, while Bryan Danielson is the youngest at 26 years old. Jeff Jarrett's reign is the longest at 570 days, while Brian Cage and Impact's first reign was the shortest at one day.

Matt Cardona is the current champion in his second reign. He won the title by defeating Shawn Spears in a street fight at the final day of Full Throttle on 13 October 2023, in Sydney, New South Wales.