Tens of thousands of protesters marched through Brussels to oppose austerity reforms introduced by Prime Minister Bart De Wever’s government.
Police estimated the crowd at around 80,000 people, while unions said more than 100,000 took part.
Demonstrators carried banners and chanted as they marched through the Belgian capital.
The protests were part of a broader mobilisation by trade unions against planned changes to pension and unemployment systems.
Some scuffles occurred during the march, with police confronting protesters and medics treating injured participants, though authorities said the demonstration was largely peaceful.