The 4th constituency of the Ain is a French legislative constituency in the Ain département.
|- style="background-color:#E9E9E9;text-align:center;" ! colspan="2" rowspan="2" style="text-align:left;" | Candidate ! rowspan="2" colspan="2" style="text-align:left;" | Party ! colspan="2" | 1st round ! colspan="2" | 2nd round |- style="background-color:#E9E9E9;text-align:center;" ! width="75" | Votes ! width="30" | % ! width="75" | Votes ! width="30" | % |- | style="color:inherit;background-color:" | | style="text-align:left;" | Michel Voisin | style="text-align:left;" | Union for a Popular Movement | UMP | | 40.73% | | 56.96% |- | style="color:inherit;background-color:" | | style="text-align:left;" | Guillaume Lacroix | style="text-align:left;" | Radical Party of the Left | PRG | | 31.32% | | 43.04% |- | style="color:inherit;background-color:" | | style="text-align:left;" | Corinne Mossire | style="text-align:left;" | National Front | FN | | 19.07% | colspan="2" style="text-align:left;" | |- | style="color:inherit;background-color:" | | style="text-align:left;" | Daniel Blatrix | style="text-align:left;" | Left Front | FG | | 3.17% | colspan="2" style="text-align:left;" | |- | style="color:inherit;background-color:" | | style="text-align:left;" | Nicolas Zielinski | style="text-align:left;" | The Greens | VEC | | 3.09% | colspan="2" style="text-align:left;" | |- | style="color:inherit;background-color:" | | style="text-align:left;" | Michèle Vianes | style="text-align:left;" | Miscellaneous Right | DVD | | 1.29% | colspan="2" style="text-align:left;" | |- | style="color:inherit;background-color:" | | style="text-align:left;" | Laurence Mayer | style="text-align:left;" | Ecologist | ECO | | 0.61% | colspan="2" style="text-align:left;" | |- | style="color:inherit;background-color:" | | style="text-align:left;" | Jean-François Mortel | style="text-align:left;" | Far Left | ExG | | 0.39% | colspan="2" style="text-align:left;" | |- | style="color:inherit;background-color:" | | style="text-align:left;" | Electre Dracos | style="text-align:left;" | Far Left | ExG | | 0.33% | colspan="2" style="text-align:left;" | |- | colspan="8" style="background-color:#E9E9E9;"| |- style="font-weight:bold" | colspan="4" style="text-align:left;" | Total | | 100% | | 100% |- | colspan="8" style="background-color:#E9E9E9;"| |- | colspan="4" style="text-align:left;" | Registered voters | | style="color:inherit;background-color:#E9E9E9;"| | | style="color:inherit;background-color:#E9E9E9;"| |- | colspan="4" style="text-align:left;" | Blank/Void ballots | | 1.31% | | 2.65% |- | colspan="4" style="text-align:left;" | Turnout | | 58.97% | | 55.81% |- | colspan="4" style="text-align:left;" | Abstentions | | 41.03% | | 44.19% |- | colspan="8" style="background-color:#E9E9E9;"| |- style="font-weight:bold" | colspan="6" style="text-align:left;" | Result | colspan="2" style="background-color:" | UMP HOLD