Havas PR and Campbell Bell Communications previously held the account.
Lexis' brief is to increase brand awareness in the UK, including working on the global competition for entrepreneurs and business start-ups called The Venture. The agency will also handle media for Chivas' Made for Gentleman series in addition to running the Chivas Regal UK press office.
Andy Stafford, associate director at Lexis, who joined the agency this year from H+K Strategies, will lead the account and report to Will Jukes, senior brand manager, Pernod Ricard UK.
Rowan Usher, comms manager at Pernod Ricard UK, said: "Lexis showed exceptional creativity that was underpinned with robust strategy and insight across multiple platforms and they will help take our exciting campaigns to the next level."
Stafford said: "It’s fantastic to add such a famous whisky brand to our consumer portfolio. Previous experience across luxury brands was important when considering our approach, but we also invested considerable time in understanding the premium spirits business and its target audiences."