The Puerto Rico Maritime Transport Authority —Spanish: Autoridad de Transporte Marítimo (ATM)— is a government-owned corporation of Puerto Rico charged with providing maritime transportation services for cargo and passengers within Puerto Rico, including the island municipalities of Vieques and Culebra.

[1] The agency is ascribed to the Department of Transportation and Public Works and was established by 1 (PDF).

January 1, 2000..[2] The agency oversees three major services for maritime transportation within the Commonwealth of Puerto Rico.

These include: 2009–present: Carlos D. Pérez Medina