Auguste Victor Laurent Casimir Périer (1811 - June 6, 1876), was a French diplomat. He was the son of Casimir Pierre Périer and the father of President Jean Casimir-Périer.

He entered the diplomatic service, being attached successively to the London, Brussels and St Petersburg embassies and in 1843 became minister plenipotentiary at Hanover.

In 1846 he resigned from the service to enter the legislature as deputy for the département of Seine, a constituency which he exchanged for Aube after the Revolution of 1848.

On the establishment of the Second Empire he retired temporarily from public life, and devoted himself to economic questions or which he published a series of works, notably Les Finances et la politique (1863), dealing with the interaction of political institutions and finance. He contested Grenoble unsuccessfully in 1863 against the imperial candidate, Casimir Royer; and failed again for Aube in 1869.

In 1871 he was returned by three départements to the National Assembly, and elected to sit for Aube. He was minister of the interior for a few months from October 11, 1871 to February 6, 1872, and his retirement deprived Thiers of one of the strongest elements in his cabinet. He also joined the short-lived ministry of May 1873 (May 18 to 25). He consistently opposed all efforts in the direction of a monarchical restoration, but on the definite constitution of the republic became a life senator, declining MacMahon's invitation to form the first cabinet under the new constitution. He died in Paris.