Abstract IntroductionObesity is the second biggest preventable cause of cancer after smoking, but only around 11% of the public are aware of the link between obesity and cancer. This study assessed the impact of a CRUK media campaign, piloted in October 2016, in the West Midlands, to raise awareness of this link. MethodsOnline surveys with adults aged 40-60 living in the intervention area (West Midlands) and a control area (Yorkshire and the Humber) were carried out pre-campaign (wave 1), post-campaign (wave 2), and three months post campaign (wave 3) (n~1200 per wave) in a Non-Randomised Controlled Trial design. Qualitative interviews - 80 on street 'intercepts' and 10 in depth - were conducted in the final week of the campaign. Measured included: awareness of the link; campaign recognition; response to the creative, attitudes to obesity related policy; any actions taken.ResultsThe campaign was associated with significantly higher awareness of the link between obesity and cancer, in the intervention sample immediately post campaign (increase of 22%), this was retained when participants were prompted 3 months after the campaign. Campaign recognition was strong, and the message and creative were well received. Support for policy remained largely unchanged, but was already high. A variety of actions were reported as a result of seeing the campaign, including changing eating behaviours. ConclusionThis was a successful campaign, which met the aim of raising awareness of the link between obesity and cancer. It engaged the public and even encouraging some people to make changes.