They protested against the firm's working practices.
It's part of a campaign called "Make Amazon Pay" led by the UNI Global Union.
It said strikes and protests would take place in more than 30 counties from Black Friday through to Monday (November 27).
On Black Friday, many retailers slash prices to boost sales.
In Coventry, England, trade union GMB said more than a thousand workers walked out at Amazon's warehouse in a long-running dispute over pay.
Stuart Richard is a trade union organizer.
"In the protest here we've got people joining us from Germany, from the U.S., from Italy, there are also Spanish workers that out on strike today. This is now a global wake-up call for Amazon. They can't keep ignoring the concerns of these workers and the workers in warehouses right across the world."
The striking workers demand a pay rise to 15 pounds - or $18.69 - an hour.
An Amazon UK spokesperson said minimum starting pay would rise up between 12.30 to 13 pounds an hour depending on location from April next year.
The company also said the strike would not cause disruption.
In Germany, Verdi trade union said hundreds of workers went on strike at warehouses, while Spain and Italy saw further industrial action.
France also saw demonstrations.
Amazon is popular in Europe, with its app having 146 million active users on the continent in October.
