Dicaprio was mobbed by journalists, fans and delegates upon his arrival.
The appearance from the award-winning actor surprised Glaswegians who expressed shock at the sightings of the Hollywood superstar and other famous faces.
One local tweeted: “President of the USA outside Greggs and Leonardo DiCaprio in Maryhill. What is this alternative reality Glasgow is living in at the moment?”
The COP26 summit is being attended by leaders from around the world, with 200 countries being asked for their plans to cut emissions by 2030.
Mr DiCaprio has donated millions to climate change organisations and backed ventures such as those producing trainers made from natural materials.
He also described campaigner Greta Thunberg as a “leader of our time” when they met in 2019.
Dicaprio arrives in Glasgow / Image: File
The news comes as leaders are expected to promise to agree on cutting deforestation
Brazil, where large parts of the Amazon rainforest have been cut down, will be among the signatories collected on Tuesday, supporting the end of deforestation.
The pledge includes almost $19.2bn USD of public and private funds.
Experts have welcomed the move but many have warned a previous deal in 2014 had “failed to slow deforestation at all” and commitments needed to be delivered on, as promised this time.
Felling trees contributes to climate change because it depletes forests that absorb vast amounts of CO2 emissions.
The two-week long UN summit held in Glasgow is seen as critical – as world leaders unite to reveal their respected nation’s plans to act on climate action.
