Activists gathered in Kelvingrove park from around 10am on Saturday with many singing and chanting in the pouring rain for hours.
Between 50,000 and 100,000 people are estimated to join in the protests with crowds descending on Glasgow Green at around 3pm.
Here is a selection of images from the protests so far.
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COP26: These incredible pictures show scenes in Glasgow as up to 100,000 people gather for climate change protest Photo: JPIMedia
. Sauchiehall Street
Protesters marching down Sauchiehall Street in Glasgow on Saturday afternoon. Photo: JPIMedia
. Humanity is failing
An activist with a sign which reads: "Humanity is failing." Photo: JPIMedia
. Crowds marching
Thousands of people joined the crowds marching through the city centre on Saturday. Photo: JPIMedia
. Only mushrooms will survive
An activist with a mushroom top on their head and a sign which reads: "With your blah blah blah only mushrooms will survive." Photo: JPIMedia
. Sauchiehall Street
Activists carrying giant paper birds marching down Sauchiehall Street in Glasgow. Photo: JPIMedia
. George Square
Protesters dressed up as Prime Minister Boris Johnson dancing in George Square. Photo: JPIMedia
17. Net Zero
A sign which reads "net zero" being held up high above the crowds of activists. Photo: JPIMedia
18. World leaders
Activists dressed up as world leaders: Trump, Putin, Murdoch, Bolsonaro and Morrison. Photo: JPIMedia
19. Crowds
More of the Glasgow crowds captured in this shot, this time with giant Unite and Unison balloons. Photo: JPIMedia
20. Protests being kettled
Here is what looks like a group of marchers being kettled in Holland Street, just off the main march route of St Vincent Street. Photo: JPIMedia