The Geary Street, Park and Ocean Railway was a street railway in San Francisco, California, United States.

The Market Street Railway Company was a commercial streetcar and bus operator in San Francisco. The company was named after the famous Market Street of that city, which formed the core of its transportation network. Over the years, the company was also known as the Market Street Railroad Company, the Market Street Cable Railway Company and the United Railroads of San Francisco. Once the largest transit operator in the city, the company folded in 1944 and its assets and services were acquired by the city-owned San Francisco Municipal Railway. Many of the former routes continue to exist into the 2020s, but served by buses.