A combined team will be looking after the corporate, consumer and stakeholder relations brief, which was previously overseen by Porter Novelli and is thought to be worth more than £1m.
The two agencies will share the brief, with Hope&Glory responsible for driving the brand's overall strategic comms and consumer brand activation and Lansons responsible for corporate and stakeholder comms.
They will report to Matthew Clark, strategic comms manager at the 1,100 year-old organisation. Clark said: 'We wanted fresh thinking and a new approach that would bring the story of The Royal Mint's heritage, people and craftsmanship to life.'
The win follows the government-owned coin manufacturer reviewing its comms needs, as revealed by prweek.
The process is understood to have been overseen by Borkowski.do and Porter Novelli did not repitch.
Work is likely to include marking the 30th anniversary of the decimal £1 coin, as well as the 60th anniversary of the Queen's coronation in July.