Émile Charles Achard (24 July 1860 – 7 August 1944) was a French internist born in Paris.

[1] In Paris, he served as médecin des hôpitaux (from 1893), later becoming a professor of general pathology and therapeutics.

In 1895, he along with E. Phulpin wrote one of the earliest studies on post-mortem microbial analysis based on forensic biology.

[4] In 1897, along with internist Joseph Castaigne (1871–1951), he developed a urinary test using methylene blue dye for examining the excretory function of the kidneys.

With Castaigne and Georges Maurice Debove (1845–1920), he published Manuel des maladies du tube digestif.