The Styria region prosecutors' office said it was “carrying out investigations against more than 70 suspects and against several associations which are suspected of belonging to and supporting the terrorist Muslim Brotherhood and Hamas organisations”.
It stressed in a statement that “the operation has no connection to the terror attack in Vienna of November 2” but was the result of “intensive and comprehensive investigations carried out for more than a year”.
Among the alleged offences are forming a terrorist association, financing of terrorism and money laundering.
The raids took place in the Styria, Carinthia, Lower Austria and Vienna regions.
Interior Minister Karl Nehammer said the raids were aimed at “cutting off the roots of political Islam”.
“We are acting against these criminal, extremist and inhuman organisations with all our strength,” he said in a statement.
Last Monday's attack by a jihadist gunman in Vienna's historic city centre left four people dead.
It was the first major attack of its kind in Austria for decades and the first blamed on a jihadist.