Stop HS2 is a national campaign group which opposes the High Speed 2 (HS2) railway project in England. The group was set up in 2010 under the slogan "No business case. No environmental case. No money to pay for it." The following year it organised a national conference and it has since challenged MPs, criticised HS2 plans and organised protest events. In 2020, the group commented on the Oakervee report and supports camps protesting construction in the Colne Valley Regional Park, Kenilworth and Wendover.