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In many countries, May Day - also known as International Workers' Day or Labour Day - is traditionally a time of political demonstrations organised by trade unions, anarchists, and socialist groups.
There were ugly scenes in Athens as protesters clashed with police during a rally called by trade unions and left-wing parties against the government's austerity measures to tackle Greece's enormous debt problem.
In the Chinese territory of Macau, police used water cannons and pepper spray against protesters who tried to break away from the approved route.
In Romania, thousands of left-wing protesters marched to the government headquarters in Bucharest demanding the resignation of the prime minister over the rise in unemployment and poverty.
Anger at rising unemployment and falling wages was also behind a mass rally in the Taiwanese capital.
In Scotland, protesters marched through Edinburgh's historic old town in an annual May Day rally over the war in Afghanistan and cuts to public services.
Far-left Ukrainian activists waved their fists and shouted anti-government slogans during a rally in Kiev.
Members of a Russian anti-fascist movement, known as Antifa, carry their flags during a rally in Moscow.This article is from the BBC News website. ? British Broadcasting Corporation, The BBC is not responsible for the content of external internet sites.