Port Klang is a town and the main gateway by sea into Malaysia. Known during colonial times as Port Swettenham but renamed Port Klang in July 1972, it is the largest port in the country. It is located about 6 kilometres (3.7 mi) southwest of the town of Klang, and 38 kilometres (24 mi) southwest of Kuala Lumpur.

Klang or Kelang, officially Royal City of Klang, is a city, royal city and former capital of the state of Selangor, Malaysia. It is located within the Klang District. It was the civil capital of Selangor in an earlier era prior to the emergence of Kuala Lumpur and the current capital, Shah Alam. Port Klang, which is located in the Klang District, is the 12th busiest transshipment port and the 12th busiest container port in the world.