Hilton will stop half-used bars of soap being sent to landfill by extending a recycling programme.
The hotel chain expects to save 64 tonnes of soap waste from UK landfill every year, creating more than 700,000 new bars in the process with environmental group Clean the World.
Hilton, which aims to ultimately recycle 100% of its leftover soap bars, says around five million partially-used bars of soap are thrown away in hotel rooms every day around the world - while thousands of people die due to lack of access to basic sanitation.
Clean the World started in 2009 to give recycled soap and other hygienic products to families in need - contributing to a 35 percent reduction in the death rate of children under the age of five dying due to hygiene-related illnesses.
The soap is made from discarded bars donated by hotels around the world, then crushed, sanitised and cut into new soap.
Shawn Seipler, founder and CEO of Clean the World, said: "The very first hotel we collected soap from was Hampton Inn by Hilton Orlando-International Airport in 2009, and today, we are eager to keep the momentum going.
"Together, we can work to eradicate diarrheal diseases and pneumonia, the two top killers of children worldwide, in our lifetime.”