Saint-Didier-d'Allier (French pronunciation: [sɛ̃ didje dalje], literally Saint-Didier of Allier; Auvergnat: Sant Desdèir d'Alèir) is a former commune in the Haute-Loire department in south-central France.

[2] On 1 January 2017, it was merged into the commune Saint-Privat-d'Allier.

[3] Its population was 48 in 2022.

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