The Department of the Coast (Spanish: Departamento de la Costa) was a short-lived department of the Protectorate of Peru that existed from 1821 to 1823.

The department's lone leader, who held the title of President, was Vicente Dupuy [es].

[1] On February 12, 1821, during the Peruvian War of Independence, the Reglamento Provisional was issued by José de San Martín, serving as the country's first legal document and constitution.

[2] The document divided the territory occupied by the Liberating Army into four departments, which included that of the Coast, north of Lima.

[2][3] On August 4 of the same year, a Provisional Statute was issued by San Martín, which formally established the Department of Lima.