By-elections to the French National Assembly are held within three months after the invalidation of the election or resignation of a deputy. No by-elections are held within the twelve months of the end of a parliamentary cycle. Eight by-elections were called during the 16th legislature of the French Fifth Republic.
| Dates | Constituency | Outgoing member | Party | Member (re)elected | Party | Reason | |||
|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 and 9 October 2022 | Yvelines's 2nd constituency | Jean-Noël Barrot | MoDem | Jean-Noël Barrot | MoDem | Resignation due to ineligibility[1] | ||
| 2 | 22 and 29 Jan 2023 | Pas-de-Calais's 8th constituency | Bertrand Petit | PS | Bertrand Petit | PS | Invalidated election[2] | ||
| 3 | Marne's 2nd constituency | Anne-Sophie Frigout | RN | Laure Miller | RE | ||||
| 4 | Charente's 1st constituency | Thomas Mesnier | HOR | René Pilato | LFI | ||||
| 5 | 26 March and 2 April 2023 | Ariège's 1st constituency | Bénédicte Taurine | LFI | Martine Froger | PS | |||
| 6 | 1 and 15 April 2023 | Second constituency for French residents overseas | Éléonore Caroit | RE | Éléonore Caroit | RE | |||
| 7 | 2 and 16 April 2023 | Eighth constituency for French residents overseas | Meyer Habib | UDI | Meyer Habib | UDI | |||
| 8 | Ninth constituency for French residents overseas | Karim Ben Cheikh | G.s | Karim Ben Cheikh | G.s | ||||