List of by-elections to the National Assembly (France)

A by-election to the National Assembly (Assemblée Nationale) of France is a special election held to fill a seat that has become vacant during the normal term of the legislature. Vacancies typically occur due to the death, resignation, or ineligibility of a sitting member of parliament (député).

French electoral law dictates the circumstances under which a by-election must be held. Generally, a by-election is required if a vacancy occurs more than one year before the next scheduled general election. However, there are exceptions and thresholds regarding the duration of the vacancy and the size of the electoral district that determine whether a by-election is mandatory.

The electoral system used in the by-election is the same as that used in a general election: a two-round system. In the first round, all candidates compete. If no candidate receives an absolute majority (more than 50%) of the votes cast, a second round is held. Only candidates who receive at least 12.5% of the registered voters in the first round are eligible to participate in the second round. In the second round, the candidate with the most votes wins the election.

The outcome of a by-election can be significant. While it may not drastically alter the overall political landscape of the National Assembly, it can provide an indication of public sentiment and the relative popularity of different political parties between general elections. The results are closely watched by political analysts and the media as a barometer of the government's approval rating and the evolving political dynamics within France.

This article serves as a list of these specific by-elections, detailing the date, constituency, cause of vacancy, and the winning candidate for each such election. The list is arranged chronologically for ease of reference. Accurate record keeping of these elections is crucial for understanding the evolution of the French political scene.