Turkey's campaign to join the EU has featured strongly in many countries.
Bulgaria's Ataka party expects to win four seats with its "No to Turkey in Europe" campaign. In the Netherlands, polls suggest the Party for Freedom (PVV) of islamophobic lawmaker Geert Wilders will take two or three seats.
The Freedom Party of Austria (FPO) campaign calls for "the West in the hands of Christians." It could get up to 19 percent of votes in the election, giving it three of Austria's 17 European Parliament seats.
The other far-right party, the Alliance for the Future of Austria (BZO), may also get one European lawmaker, according to polls.
In Romania, the Greater Romania Party also hopes to get an EU parliament seat after a campaign under the headline: "Christians and patriots to rid this country of thieves."