Dutch Foreign Minister Maxime Verhagen said there must be "concrete measures taken to ensure that the Internet remains a universal forum" and singled out Iran for blocking access to anti-government websites.
"We must support cyber-dissidents in the same way that we supported political dissidents," French Foreign Minister Bernard Kouchner told a meeting in Paris attended by some 20 countries including the United States and Japan.
Officials from Google and Microsoft attended the meeting in Paris, the first by a working group on freedom of expression on the Internet.
Concerns about Internet censorship have mostly focused on Iran and China.
The Dutch foreign minister said blocking websites and social networking sites was "a violation of human rights".
Jean-Francois Julliard, from the media rights group Reporters Without Borders (RSF), accused French phone equipment provider Alcatel of selling bugging equipment to Myanmar.
"We can also raise questions about the responsibility of France Telecom as a shareholder in operators in Morocco and Tunisia where information does not flow freely on the Internet," Julliard said.