Amsterdam judge Marcel van Oosten accepted the Freedom Party leader's statements were directed at Islam and not at Muslim believers.
They were, the judge ruled, "acceptable within the context of public debate".
It is believed the plaintiffs may attempt to make their case before a European court or the UN.
This is an important victory for freedom of speech in Europe. However ugly some of Wilders' ideas and policies may be, they should be opposed with arguments for better ones, not by suppressing them as an exercise of state power.