Louis Prosper Gachard (12 March 1800 – 24 December 1885), Belgian man of letters, was born in Paris.

He entered the administration of the national archives in 1826, and was appointed director-general in 1831, a post which he held for fifty-five years.

During this long period he reorganized the service, added to the records by copies taken in other European collections, travelled for purposes of study, and carried on a wide correspondence with other keepers of records, and with historical scholars.

[1] He was the author of several historical writings, of which the best known are Don Carlos et Philippe II (1863), Études et notices historiques concernant l'histoire des Pays-Bas (1863), Histoire de la Belgique au commencement du XVIIIème siècle (1880), Histoire politique et diplomatique de P. P. Rubens (1877), all published at Brussels.

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