The Port of Mongla is a link seaport, located at Mongla Upazila, Khulna Division, Bangladesh. It is a sea port of Khulna city, which is located to the north. It is the second largest and busiest seaport of Bangladesh. The Mongla port lies close to the shore of Bay of Bengal and Pashur river. Mongla is renowned among the major important ports of the Bengal delta. Due to the increasing congestion in Bangladesh's largest port in Chittagong, many international shipping companies have turned to Mongla as an alternative. Also the continuous demand from all over the country and neighbouring countries has made it busier and economically attractive.

Also some political and economical influence in Khulna region from the government also prevailing the development and demand of the port of Mongla. Padma Bridge megaproject is a big example of such influence in Khulna region. Mongla is also a gateway for tourist ships traveling to the largest mangrove forest of world, the Sunderbans. It is also marked as a resource of UNESCO World Heritage Site. The port also hosts the Mongla Export Processing Zone (Mongla EPZ).

Bangladesh gives India permanent access to Chattogram, Mongla ports.

The port was founded in 1950 to serve the southwestern region of East Bengal. It was originally known as Chalna Port.

In July 2024, India obtained operational rights to Mongla port.

It was formerly located at Chalna, about 18 kilometres (11 mi) upstream on the Pasur River but it is now located 48 km south of Khulna city, as established on 11 December 1954. The Port is surrounded and protected by the Sundarban mangrove forest. The port is situated at the confluence of the Pasur River and the Mongla River. It lies about 100 km (62 mi) north of the Bay of Bengal.

The port has 11 jetties and 8 warehouses. It uses 12 swinging moorings in deeper sections in the river. The port is connected by the Bangladesh Railway to the Khulna Metropolitan Area.

In 2015–16, 636 ships used Mongla port. Mongla is connected to most major ports in the world, particularly Asian ports. Hundreds of ships use the port each year, most of which come via Singapore, Hong Kong and Colombo. Mongla is also connected to most inland ports in Bangladesh, including the Port of Dhaka and the Port of Narayanganj.

In 2018, Bangladesh granted India full access at this port as well as the Chittagong Port or shipping transportations.

The port is open for 24 hours and up to 225 metre long ships can enter into the port for discharging cargo. A constraint free large channel is available for anchorage and loading/unloading facilities on both sides for 33 ships at a time.

The government of Bangladesh has launched dredging and jetty construction projects to expand the capacity of Mongla port.

• Countries dependent on the Bay of Bengal