Several surveys in recent months have put her in the lead, but the new survey, with 13,060 respondents, is seen as more weighty.
If the trend holds, she could face centrist Édouard Philippe in the second round. But that would be only if his rival from the same political camp, Gabriel Attal, throws in the towel, according to the Ipsos-BVA poll published in Le Monde.
If both compete for votes and thus divide the centrist electorate between them, left-wing leader Jean-Luc Mélenchon looks set to make it to the second round.
Le Pen has decided to run in the presidential election despite a high-profile conviction against her for misuse of EU funds.
