Protesters calling for "persecuted" white South African farmers to be brought to Australia have clashed with counter-demonstrators outside Foreign Minister Julie Bishop's electorate office in the Perth suburb of Subiaco.

Right wing political party the Australian Liberty Alliance organised the protest to support calls made by Home Affairs Minister Peter Dutton in March that farmers in South Africa are under threat and deserve "special attention" and need help from a "civilised country" like Australia.

A counter-demonstration made up of left wing groups has taken up positions at a park on the opposite side of the road, chanting slogans and opposing the ALA's moves.

6PR radio reports the groups, comprising about 100 people, briefly clashed.