Concerned about the role hackers and false news might have played in the United States election, the Dutch government announced on Wednesday that all ballots in next month’s elections would be counted by hand.

The decision to forgo electronic counting is a stark response to warnings that outside actors, including Russia, might try to tamper with pivotal elections this year in the Netherlands, France and Germany — three major democracies in which establishment parties are facing pressure from right-wing populism of the kind that fueled Britain’s vote to leave the European Union and Donald J. Trump’s triumph in the United States election.

“The cabinet cannot exclude the possibility that state actors might gain advantage from influencing political decision-making and public opinion in the Netherlands and might use means to try and achieve such influence,” Interior Minister Ronald Plasterk said in a statement. “We’re talking about actors that both have the intention and ability to do this.”

Parliament recently discussed the finding by intelligence agencies that the Russian government tried covertly to help Mr. Trump, and Mr. Trump’s allegations — made without evidence — that millions of undocumented immigrants had cast ballots, costing him the popular vote.