The Transamerica Pyramid is a pyramid-shaped 48-story modernist skyscraper in San Francisco, California, United States, and the second tallest building in the San Francisco skyline. Located at 600 Montgomery Street between Clay and Washington Streets in the city's Financial District, it was the tallest building in San Francisco from its completion in 1972 until 2018 when the newly-constructed Salesforce Tower surpassed its height. The building no longer houses the headquarters of the Transamerica Corporation, which moved its U.S. headquarters to Baltimore, Maryland. The building is still associated with the company by being depicted on the company's logo. Designed by architect William Pereira and built by Hathaway Dinwiddie Construction Company, the building stands at 853 feet (260 m). On completion in 1972 it was the eighth-tallest building in the world. It is also a popular tourist site. In 2020, the building was sold to NYC investor Michael Shvo, who in 2022 hired Norman Foster to redesign the interiors and renovate the building.

Montgomery Street is a north-south thoroughfare in San Francisco, California, in the United States.