The Port of Houston is the port of Houston, Texas, the fourth largest city in the United States. The port is a 25-mile-long complex of diversified public and private facilities located just a few hours' sailing time from the Gulf of Mexico. It is the busiest port in the United States and second busiest in the world in terms of foreign tonnage.

The Port of Houston is made up of the Houston Ship Channel and Galveston Bay. It is made up of the port authority and the 150-plus private industrial companies along the ship channel; many oil companies have built refineries on the channel where they are protected from the Gulf of Mexico. The petrochemical complex associated with the Port of Houston is one of the largest in the world.

Approximately 175 million tons of cargo moved through the Port of Houston in 2002. A total of 6,414 vessel calls were recorded at the Port of Houston during the year 2002.