Officers made arrests after crowds, waving placards expressing support for the group, gathered in Parliament Square, the force said on X.
Protesters, some wearing black and white Palestinian scarves, chanted "shame on you" and "hands off Gaza", and held signs such as "I oppose genocide. I support Palestine Action", video taken by Reuters at the scene showed.
The ban makes it a crime to be a member of the group, carrying a maximum sentence of 14 years in prison.
The co-founder of Palestine Action, Huda Ammori, last week won a bid to bring a legal challenge against the ban.
MA/PR
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