Hundreds of demonstrators marched through Athens in tribute to 15-year-old Alexandros Grigoropoulos, who was gunned down by officers in 2008.
Riot police were forced to storm the Exarchia district with batons and tear gas after protesters started throwing petrol bombs and fireworks.
Over two thousand officers were deployed to help create a ring of steel around sensitive locations, while a helicopter circled above.
Bins and cars were torched as the massive throng made its way through the city.
Clashes also broke out during demonstrations in the northern city of Thessaloniki, with police firing teargas and stun grenades at protesters after being pelted with stones and petrol bombs.
In 2008 thousands took to the streets after Grigoropoulos was shot.
The carnage marked Greece's worst riots in decades.
Cops battled for weeks to regain control, with thousands of protesters fuelled by anger over unemployment and economic hardship.
It comes after protesters in France – wearing their signature yellow vests – vowed to carry on with their violent anti-government demonstrations, as part of a “revolution”.
Ultra-right groups want to tap into the widespread anger against President Macron to help overthrow the "system" in a "smash and kill mission".
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