Charles Auguste Frossard (26 April 1807 – 25 August 1875) was a French general. He entered the army from the École polytechnique in 1827, being posted to the engineers. He took part in the siege of Rome in 1849 and in that of Sevastopol in 1855, after which he was promoted general of brigade. Four years later as general of division, and chief of engineers in the Italian campaign, he attracted the particular notice of the emperor Napoleon III, who made him in 1867 chief of his military household and governor to the prince imperial.