Antoine Ritti (6 February 1844, Strasbourg - 23 January, 1920, Paris) was a French psychiatrist.
Ritti, whose uncle was Andreas Räss, the Bishop of Strasbourg, seemed originally destined to become a priest.
However he chose to take up a medical career.
He began his training as a psychiatrist at the asylum of Fains Meuse.
He became influenced by the ideas of Auguste Comte becoming a positivist.
Following the outbreak of the Franco-Prussian war he left Alsace for Paris, working at the Lariboisière Hospital during the Paris Commune.
He obtained an in-house post at the Charenton Asylum.
In 1878 he was appointed to a doctor's office in Charenton, a position he held until his retirement in 1909.Ritti studied under Jules Bernard Luys and applied Luys' anatomical-functional discoveries to develop a theory of the role of the thalamus in the pathophysiology of hallucinations.
For 38 years, from 1882 to 1920, Ritti was Secretary-General of the Medico-Psychological Society.