Stop Islamisation of Denmark (Danish: Stop Islamiseringen af Danmark, SIAD)da is a Danish anti-Islam organisation founded in 2005.

[1] The group was founded by Anders Gravers Pedersen who began the development of the activist part of the counter-jihad movement.

[2] The organisation considers its work to be comparable to the resistance movement during the Second World War, and a report by the Danish Center for Social Science Research on extremist movements in 2014 designated the group as "radical right".

[3] The group has been active in campaigning against the building of mosques in Denmark and has staged free speech demonstrations in relation to the Jyllands-Posten Muhammad cartoons controversy.

In 2007 the group protested outside of the European Union headquarters in Brussels,[4] and launched the Europe-wide Stop Islamisation of Europe (SIOE) following the international counter-jihad conference in Copenhagen.