The 2009 Amgen Tour of California was the 4th running of an annual cycling race contained within the state of California. The event was staged February 14–22 and began with a prologue in the state capital of Sacramento. The event was held as part of the schedule of both the UCI America Tour and USA Cycling Professional Tour. The race was won by Levi Leipheimer for the third consecutive year.

The Tour of California was an annual professional road cycling stage race on the UCI World Tour and USA Cycling Professional Tour that ran from 2006 to 2019. It was the only event on the top-level World Tour in the United States. The eight-day race covered 650–700 miles (1,045–1,126 km) through the U.S. state of California.