Relentless sponsors various teams and athletes from the core sports in the UK.
In October 2006, Relentless teamed up with Motorcross Team Rob Hooper's Suzuki to create "Relentless Suzuki." Lewis Gregory, Jamie Law and Alex Snow are the riders for the team, which will compete in all the major UK and European MX2 events.
Relentless also teamed up with TAS Suzuki, a Northern Ireland-based motorcycle road racing team, and the team is now known as "Relentless Suzuki by TAS Racing". The team fields bikes in the British Superbike Championship, with riders Michael Laverty in the Superbike class and Ian Lowry in the Supersport class (which was won by Laverty in 2007 on the Relentless Suzuki). Cameron Donald and Guy Martin race at International road racing events, such as the Isle of Man TT, North West 200, and Ulster Grand Prix, for the team. Donald and Anstey recorded a 1 – 2 for the team in the first race of the 2008 TT, the Dainese Superbike Race. Relentless was the title sponsor of Faithless frontman Maxi Jazz in 2006 during his Porsche Carrera Cup Great Britain campaign.
Also in 2008, Relentless sponsored Formula Palmer Audi driver Emma Selway.
Mike & Andrew Jordan also had Relentless sponsorship on their British Touring Car Championship Honda Integras.
Relentless was a main sponsor of the Reading and Leeds festivals in 2007. There were large stalls shaped like giant Relentless cans solely dedicated to selling the drink. There were also copious flags and signs dotted around the festival sites.
Relentless has renewed the sponsorship of the Leeds and Reading festivals for 2008 after Carling discontinued their sponsorship of the music festival.
In January 2009, Relentless began sponsoring the annual Kerrang! Tour put together by British music magazine Kerrang!.
In 2009, Relentless was the principal sponsor of the Newquay Boardmasters festival.[21]
Relentless is the primary sponsor of Uniwake, the UK's national organisation for inter-university wakeboarding events. The sponsorship began in May 2009 and continues to the present day. This includes the BUCS Student Wakeboarding Championships held in June each year at Sheffield Cable Waterski in Sheffield.[22]
In 2010, Relentless was the title sponsor of Team Bath Racing the Formula Student Team from Bath University.[23]
Relentless was the principal sponsor of the Wakestock music and wakeboarding festival in Abersoch, North Wales, with the festival, therefore, being branded Relentless Wakestock.[24] But has now lost the event contract. Now, no Relentless branding appears on the Wakestock website.
Relentless is also a sponsor of the "Bundesligaachter Mülheim an der Ruhr" a German rowing eight competing in the "1. Ruder Bundesliga", and its one sponsor of the Strakka Racing since 2009 in Endurance Racing.
Since 18 July 2013, Relentless has been the main sponsor of the FC St. Pauli professional men's football team in Hamburg, Germany.
