The Port of Montreal (French: Port de Montréal, pronounced [pɔʁ də mɔ̃ʁeal]) (ACI Canadian Port Code: 0395, UN/LOCODE: CA MTR) is a cruise and transshipment point. It is located on the St. Lawrence River in Montreal, Québec, Canada. The port operates as an international container port. It services Quebec, Ontario, Toronto, the rest of Central Canada, the Midwestern United States, and the Northeastern United States. Though found on the Saint Lawrence Seaway, it is some 1,600 kilometres (990 mi) inland from the Atlantic Ocean and it is on the shortest direct route between the North American Midwest and Europe or the Mediterranean.

In 2024, more than 2,000 cargo ships visited with the port, while handling 35,410,000 metric tonnes of consumer goods, machinery, cereal, sugar, petroleum products, and other types of cargo. Montreal is also a port for cruise ships. The port is operated by the Montreal Port Authority. As of 2024 it is estimated the port's activities support an estimated 600,000 jobs directly and indirectly across Montreal and Quebec.

The port originated in the historic area now known as the Old Port of Montreal. Over the years, the Port of Montreal expanded eastward along the waterfront. In 1978, the Port of Montreal ceded the area now known as the Old Port to the Old Port of Montreal Corporation, a public corporation responsible for developing tourism and recreational activities in the area. The site is a tourist attraction, featuring museums, restaurants, shops and water-related activities. Most Port of Montreal facilities are located downstream from the Old Port. The Montreal Port Authority's head office and the multipurpose Bickerdike Terminal are located upstream from the Old Port.

Starting from the first authority:

Maritime and port activity in Montreal supports some 18,280 jobs and provides $1.5 billion in economic benefits to the Canadian economy (Secor study, 2008).

The Province of Québec announced in May 2013 the signature of a collaborative framework with the City of Montreal for the extension of a thoroughfare that was designed to link with port facilities. The province also announced the construction of an exit ramp from a major highway to allow trucks to directly reach the port, and the reconfiguration of an entrance ramp on the same highway to provide trucks leaving the port with direct access to the highway network. The two projects were designed to improve truck access at the Port of Montreal.

The Canada Infrastructure Bank announced $300 million in support of the Port of Montreal expansion project in Contrecoeur in 2018, and the Quebec government announced $55 million in financial assistance in 2021 and an additional $75 million in 2023.

The Port of Montreal was behind the creation of the Logistics and Transportation Metropolitan Cluster of Montreal, or Cargo Montreal, an initiative to help consolidate Montreal as a centre for goods transportation. The project is supported by the Metropolitan Community and its activities are financially supported by Québec's Finance and Economy Ministry, Executive Council Ministry, the Montreal Metropolitan Community and all Cargo Montreal members, while Transport Canada is a participant.