The account was previously held by Touch PR.
Salt will manage the UK consumer comms for William Grant, whose brands include Glenfiddich, Grant’s, Sailor Jerry and Hendrick’s. The agency will also provide ad hoc trade PR and internal comms support.
Andy Last, chief executive at Salt, said: "William Grant & Sons UK is a pioneering and entrepreneurial company with a great vision. Our team was inspired by its values and passion and is thrilled to have won it over with a different approach to comms, fresh insights and digital expertise."
William Grant is midway through a pitch to appoint a global consumer PR agency to promote its Irish whiskey brand Tullamore Dew.
Salt is a London and Singapore-based global PR agency.