| party = Republican }}
Although he played stereotypical Latinos, Leo Carrillo was part of an old and respected California family. His great-great grandfather, José Raimundo Carrillo (1749–1809), was an early Criollo settler of San Diego, California. His great-grandfather Carlos Antonio Carrillo (1783–1852) was Governor of Alta California (1837–38), his great-uncle, José Antonio Carrillo, was a three-time mayor of Los Angeles, and his paternal grandfather, Pedro Carrillo, who was educated in Boston, was a writer.
The family moved from San Diego to Los Angeles then to Santa Monica, where Carrillo's father Juan José Carrillo (1842–1916), served as the city's police chief and later the first mayor. His cousin was Broadway star William Gaxton (real name Arturo Antonio Gaxiola). Proud of his heritage, Carrillo wrote a book, The California I Love, published shortly before his death in 1961.
A university graduate, Carrillo worked as a newspaper cartoonist for the San Francisco Examiner before turning to acting on Broadway. In Hollywood, he appeared in more than 90 films, including The Gay Desperado (1936), in which he usually played supporting or character roles.
However, he is best remembered from the television series The Cisco Kid, on which, beginning at the age of seventy, he portrayed the sidekick Pancho, a role that he had previously played in several films. Duncan Renaldo (1904–1980) starred as The Cisco Kid. The popular syndicated series ran from 1950 until 1956, with most episodes in color. After The Cisco Kid ended production, Carrillo appeared in the episode "Rescue at Sea" of the syndicated military drama, Men of Annapolis.
A preservationist and conservationist, Carrillo served on the California Beach and Parks commission for eighteen years and played a key role in the state's acquisition of Hearst Castle at San Simeon, the Los Angeles Arboretum, and the Anza-Borrego Desert State Park. He was eventually made a goodwill ambassador by the State Governor at the time.
As a result of his service to the State, the Leo Carrillo State Park, west of Malibu on the Pacific Coast Highway, was named in his honor, and the city of Westminster, California named an elementary school for him. The Leo Carrillo Ranch Historic Park, originally Rancho de los Kiotes, in Carlsbad, California, is a registered California Historical Site. Rancho Carrillo Trail, also in Carlsbad, is named for Leo Carrillo.
Carrillo was a Republican. In 1944, for instance, he performed a "Wild West" act at the massive rally organized by David O. Selznick in the Los Angeles Coliseum in support of the Dewey-Bricker ticket as well as Governor Earl Warren of California, who would become Dewey's running mate in 1948 and later the Chief Justice of the United States. The gathering drew 93,000, with Cecil B. DeMille as the master of ceremonies and with short speeches by Hedda Hopper and Walt Disney. Among the others in attendance were Ann Sothern, Ginger Rogers, Randolph Scott, Adolphe Menjou, Gary Cooper, Eddy Arnold, William Bendix, and Walter Pidgeon.
In 1913, Carrillo married Edith Shakespeare, of Nyack, New York, whom he met backstage at the New York City theater where she had seen him perform. They remained together until her death in 1953. They lived in "Los Alisos" ("The Sycamores") on Channel Road, in Santa Monica Canyon. The Carrillos had one child, a daughter Marie Antoinette. They spent part of their time at their 4,500-acre (1,800 ha) ranch in Carlsbad. Boy Scout groups were frequently permitted by Carrillo to camp on the grounds.
- Mexicana (1945)
- "Leo Carrillo SP State Park". www.parks.ca.gov. Retrieved 2010-04-16.
- "José Raimundo Carrillo (1749-1809)". sandiegohistory.org. Retrieved 2010-04-16.
- "Leo Carrillo biography". Leocarrillo.net. Retrieved 2012-04-03.
- "PIO PICO GENEALOGY DATABASE". www.piopico.org. Retrieved 2010-04-16.
- "Santa Monica". www.worldvisitguide.com. Retrieved 2010-04-16.
- "Leo Carrillo The California I Love". film.virtual-history.com. Retrieved 2010-04-16.
- "Leo Carrillo Ranch Historic Park". Leocarrilloranch.org. 2011-08-26. Retrieved 2012-04-03.
- Rancho Carrillo Trail Retrieved 2012-03-30.
- David M. Jordan, FDR, Dewey, and the Election of 1944 (Bloomington and Indianapolis: Indiana University Press, 2011), p. 231
- "Hollywood Star Walk Leo Carrillo". Los Angeles Times. Retrieved 2012-03-30.
- Leo Carrillo at the Internet Broadway Database
- Leo Carrillo at the Internet Movie Database
- Leo Carrillo at the TCM Movie Database
- Leo Carrillo at Find a Grave
- Leo Carrillo Ranch Historic Park
- Friends of Carrillo Ranch
- Community of Rancho Carrillo - Riverside County
- The Colt Revolver in the American West—Leo Carrillo's Single Action Army