The New York Port of Embarkation (NYPOE) was a United States Army command responsible for the movement of troops and supplies from the United States to overseas commands. The command had facilities in New York and New Jersey, roughly covering the extent of today's Port of New York and New Jersey, as well as ports in other cities as sub-ports under its direct command. During World War I, when it was originally known as the Hoboken Port of Embarkation with headquarters in seized Hamburg America Line facilities in Hoboken, New Jersey, the Quartermaster Corps had responsibility. The sub-ports were at Boston, Baltimore, Philadelphia and the Canadian ports of Halifax, Montreal and St. Johns. The World War I port of embarkation was disestablished, seized and requisitioned facilities returned or sold and operations consolidated at the new army terminal in Brooklyn. Between the wars reduced operations continued the core concepts of a port of embarkation and as the home port of Atlantic army ships. With war in Europe the army revived the formal New York Port of Embarkation command with the New York port, the only Atlantic port of embarkation, taking a lead in developing concepts for operations.

In World War II the NYPOE, now under the new Transportation Corps, was the largest of eight Port of Embarkation commands, the second largest being the San Francisco Port of Embarkation and the second largest on the East Coast being Hampton Roads Port of Embarkation. Originally it had the army facilities in Charleston, South Carolina as a sub-port until it was elevated to the Charleston Port of Embarkation as a separate command. The cargo sub-port at Philadelphia remained under the command of NYPOE throughout the war. By the end of the war 3,172,778 passengers, counting 475 embarked at the Philadelphia cargo port, and 37,799,955 measurement tons of cargo had passed through the New York port itself with 5,893,199 tons of cargo having passed through its cargo sub-port at Philadelphia—about 44% of all troops and 34% of all cargo passing through army ports of embarkation.