The demonstration comes at the start of what is expected to be two weeks of action in the capital.
A protest by a small group of Just Stop Oil activists has slowed traffic on a central London road, causing tailbacks.
About 12 climate change demonstrators walked along the Strand carrying banners, slowing cars and buses.
Another demonstration was held in Shepherd’s Bush, west London, at the start of what is expected to be two weeks of action.
The Met Police arrested 755 Just Stop Oil activists during a number of protests in October and November.
Some onlookers waiting for buses in the Strand reacted angrily to the latest demonstration saying the protesters were delaying their onward travel, although others expressed their support for the group.
Small moving protest by @JustStop_Oil near Trafalgar Square, now heading along the Strand pic.twitter.com/bGtFiXGhwF
— Harry Low (@HarryLow49)
The Met said it believed demonstrators were planning disruptive activity across the capital until 14 December.
On Sunday, Cdr Karen Findlay said police were “fully prepared” for any protests, and “where activists cross the line into criminality, the Met will provide a proportionate policing response”.
Just Stop Oil are calling on the government to end all new oil and gas projects to tackle climate change.