Franck Sylvain (French pronunciation: [fʁɑ̃k silvɛ̃]; August 3, 1909 – January 3, 1987) served as acting President of Haiti in 1957.

He also was a founder of the "Rally for the Haitian people" (Rassemblement du Peuple Haïtien), a clandestine party.

During the rule of Paul Magloire from 1950 to 1956 he was judge and gained a good reputation, having expressed an opinion in a proceeding against a close friend of the president.

On 7 February 1957, he was appointed by Parliament as the successor of Joseph Nemours Pierre-Louis, Haiti's interim president.

Sylvain served as president for only 56 days, then he was deposed by General Léon Cantave.