Leonard Kimball Firestone (June 10, 1907 – December 24, 1996) was an American businessman, diplomat, and philanthropist.

He was educated at The Hill School, and graduated from Princeton University in 1931, where he played golf and polo.

He was commissioned in the United States Navy as a lieutenant, but was assigned to inactive status to become president of Firestone Tire and Rubber Company in 1943.

[5] Inspired by a 10–year local weather study, Firestone and two neighboring ranchers developed vineyards in Santa Ynez, California, in 1972.

In partnership with his father, he founded the first commercial winery to crush grapes in Santa Barbara County.

Firestone took a particular interest in charities associated with alcohol abuse, and was cofounder of the Betty Ford Center in 1982.