FAR-right Dutch politician Geert Wilders has called the Prophet Muhammad a murderer and used Anzac soldiers as an example of the courage needed to speak out against Islam at a speech to Melbourne supporters.

Tight security surrounded Mr Wilders' hour-long speech to members of the ultra-conservative local group the Q Society of Australia at La Mirage reception centre in Somerton in Melbourne's north on Tuesday night.

Fifty police, some on horseback, separated about 100 vocal but peaceful protesters standing on the Hume Highway verge outside the venue.

Protest organiser Feiyi Zhang said: "we're here to show we will not stand for Wilders' racism and Islamophobia". She said his speech could incite violence against Muslims "and general fear of Islam".