Luchford said the PR campaign for the Marriott aims to engage international luxury lifestyle, consumer, corporate, trade and MICE (meetings, incentives, conferences and exhibitions) media.
It comes as the venue undergoes a renovation project to be completed in June 2015.
Nicolas Kipper, general manager of London Marriott Hotel Park Lane, said: "Luchford APM’s luxury credentials were perfect for the brief to help us relaunch the hotel with an enhanced offering."
Luchford APM founder and CEO Kelly Luchford said: "Drawing from our deep understanding of luxury travel and lifestyle brands, we will develop a strategy for the hotel to build on its existing profile and to position it upwards to become the best of Marriott in London."
Luchford has become the retained agent for The Lanesborough to support its international comms campaign for its own extensive renovation project, to be completed next spring.
Last month Luchford APM won a three-way pitch to represent Beverly Beverly Hills Conference and Visitors Bureau. The 12-month contract will focus on consumer and travel trade media, aimed at developing Beverly Hills "from a luxury travel brand to a luxury lifestyle consumer product".