Louis August Chorin MEP (17 July 1888 – 29 April 1965) was a French Roman Catholic missionary and bishop who served as Vicar Apostolic of Bangkok from 1947 to 1965.

In 1908, he entered the Paris Foreign Missions Society seminary, and was ordained a priest on 29 September 1912.

He was assigned to work in Bang Nok Khwaek as vicar by Bishop Perros where he learned Chinese.

Later, he was recalled to Bangkok as director of the printing press at the Church of Assumption, and during the First World War, he published the magazine "Sangha Samphan".

To promote the Catholic Church in Thailand, he chose a Thai coadjutor on 13 September 1963, Joseph Khiamsun Nittayo, who subsequently succeeded him.