Fosters Freeze (full name Foster's Old Fashion Freeze) is a chain of fast-food restaurants in California. It was founded by George Foster in 1946 on La Brea Avenue in Inglewood, California, a location that still remains, and claims to have been the first fast-food chain in the state. Its name comes from the fact that it is best known for its soft-serve milkshakes and ice cream, which is reflected in the marketing slogan, 'California's Original Soft Serve.'

However, the company also offers a variety of foods, including hamburgers, chicken strips, and fish. The restaurant's original slogan was 'Everything at Foster's is wonderful to eat' and the slogan has taken on a retro appeal in recent years.

Its mascot is an ice cream cone wearing a chef's hat. The company's first locations in California included Sunnyvale, Mountain View, and Palo Alto. The Palo Alto location, across the street from Stanford University's Campus on El Camino, remains virtually unchanged since c. 1950.