The world’s largest hotel chain plans to stop using small plastic bottles of shampoo, conditioner and shower gel at all sites by December 2020.
Marriott, which has 7,000 sites worldwide, will replace the single-use plastics with larger pump-topped bottles or wall-mounted dispensers.
The change is expected to prevent about 500 million tiny bottles from going to landfill each year.
The company owns brands including Sheraton, Westin and Ritz-Carlton and has already rolled out larger bottles at 1,000 sites in North America.
Arne Sorenson, President and Chief Executive Officer of Marriott International, said: "This is our second global initiative aimed at reducing single-use plastics in just over a year, which underscores how important we believe it is to continuously find ways to reduce our hotels’ environmental impact.
"It’s a huge priority for us."