HouTran was a public transportation company that served the Houston area. While its last iteration was publicly owned by the City of Houston, it was privately owned throughout the vast majority of its existence. Throughout several name changes and ownership acquisitions, the company's modes of operation ranged from mule-drawn streetcars to electrified streetcars, and finally to busses. In 1979, it was succeeded by the Metropolitan Transit Authority of Harris County, a state-authorized local transit authority, when it was purchased by that agency as the basis for its then new transit system.

The Metropolitan Transit Authority of Harris County is a major public transportation agency based in Houston, Texas, United States. It operates bus, light rail, bus rapid transit, HOV and HOT lanes, and paratransit service in the city as well as most of Harris County. It also operates bus service to two cities in Fort Bend County, and to Conroe in Montgomery County. The Metro headquarters are in the Lee P. Brown Administration Building in Downtown Houston. In 2023, the system had a ridership of 77,189,800, or about 232,800 per weekday as of the fourth quarter of 2023.