L. John Doerr (born June 29, 1951) is an American investor and venture capitalist at Kleiner Perkins in Menlo Park, California. In February 2009, Doerr was appointed a member of the President's Economic Recovery Advisory Board to provide the President and his administration with advice and counsel in trying to fix America's economic downturn. In 2017, related to Forbes, he was recognized the 40th Richest in Tech. Forbes ranked Doerr as the 196th richest person in the world, with a net worth of US$ 9.8 billion as of April 12, 2023. Doerr is the author of Measure What Matters, a book about goal-setting, and Speed & Scale: An Action Plan for Solving Our Climate Crisis Now.

In 2022, John and his wife Ann collaborated with Stanford University to launch its first new school in about 70 years: Stanford Doerr School of Sustainability.