Two by-elections were held in Italy on 22 and 23 March 2026. The elections took place at the same time as the 2026 Italian constitutional referendum.
A by-election will be held in the constituency of Rovigo on 22 and 23 March 2026 to replace a deputy for the seat left vacant by Alberto Stefani (Lega), who was elected President of Veneto Region at the last regional elections held in 2025. The centre-right chose the treasurer of Lega, Alberto Di Rubba, while the centre-left selected Giacomo Bovolenta, secretary of IV for the Province of Rovigo. The local Five Star Movement declared that they would not support a candidate from Renzi's party and withdrew their support from the candidate for this by-election. Lega member Alberto Di Rubba won the election.
A by-election will be held in the constituency of Selvazzano Dentro on 22 and 23 March 2026 to replace a deputy for the seat left vacant by Massimo Bitonci (Lega), who was appointed Regional Assessor for Business and Commerce of the Veneto Region after the last regional elections held in 2025. Lega member Giulio Centenaro won the election.