An Ipsos-Sopra survey indicated the Front National leader will tie with independent centrist Emmanuel Macron with 22 per cent in the first round of voting on 23 April.
The two are placed just ahead of rivals Francois Fillon and far-left candidate Jean-Luc Melenchon, on 20 and 19 per cent respectively.
A new study predicts Le Pen will qualify to the second round of voting
The three per cent gap separating the four candidates is within the poll’s margin of error – suggesting any of the four candidates could make it through to the second round.
But Le Pen could be within reach of victory in the second round of voting on 7 May, should she face left-winger Melenchon, who has enjoyed a late surge in support.
Melenchon is a former Trotskyist who intends to pull France out of Nato and, like Le Pen, possibly the European Union too.
Left-winger Melenchon has enjoyed a late surge in support
Marion Le Pen in pictures
Wed, July 27, 2016
The niece of French far-right leader Marine Le Pen has joined the military reserve and has urged "young patriots" to follow in her footsteps, take a look through her career to date,
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French far right Front National (National Front – FN) party's Parliament member and candidate for the regional elections in the Provence-Alpes-Cote d'Azur (PACA)
French pollsters BVA said “all scenarios are possible” for the first round of voting.
They added: "A second round with Emmanuel Macron and Marine Le Pen remains the most likely hypothesis, but nothing excludes that Francois Fillon or Jean-Luc Melenchon would qualify instead.”
Polls suggest up to a third of France’s 45.7 million voters could abstain, which analysts have said could help Macron and Fillon.
The poll places Le Pen level with independent centrist Macron
But BVA argued that Le Pen and Melenchon would benefit most from a surge in young and working class voters in either round of voting.
French judges this week asked for Le Pen’s parliamentary immunity to be lifted amid investigations she misused EU funds to pay for party assistants.
Yet her legal woes have not harmed her in the same way allegations of nepotism has affected former frontrunner Francois Fillon in the polls.