The District Attorney of Los Angeles County prosecutes felony and misdemeanor crimes that occur within the jurisdiction of Los Angeles County, California.
Some misdemeanor crimes are prosecuted by local city attorneys. City attorneys prosecute misdemeanors and infractions that are violations of the municipal code governing the incorporated city's (e.g. Los Angeles and Long Beach) jurisdiction. All other misdemeanor, felony and infraction violations that occur within Los Angeles County are prosecuted by the district attorney. According to the district attorney's official website, the Los Angeles County District Attorney's office is the largest local prosecutor's office in the United States.
| Num. | Name | Term |
|---|---|---|
| 01. | William C. Ferrell | 1850–1851 |
| 02. | Isaac K. Ogier | 1851–1852 |
| 03. | Kimball H. Dimmick | 1852–1853 |
| 04. | Benjamin Eaton | 1853–1854 |
| 05. | Cameron E. Thom | 1854–1857 |
| 06. | Ezra Drown | 1857–1859 |
| 07. | Edward J. C. Kewen | 1859–1861 |
| 08. | Ezra Drown | 1861–1863 |
| 09. | Alfred B. Chapman | 1863–1864 |
| 10. | Volney E. Howard | 1864–1867 |
| 11. | Alfred B. Chapman | 1867–1869 |
| 12. | Cameron E. Thom | 1869–1873 |
| 13. | Volney E. Howard | 1873–1876 |
| 14. | Rodney Hudson | 1876–1877 |
| 15. | Cameron E. Thom | 1877–1879 |
| 16. | Thomas B. Brown | 1879–1882 |
| 17. | Stephen M. White | 1882–1884 |
| 18. | George M. Holton | 1884–1886 |
| 19. | George S. Patton, Sr. | 1886–1887 |
| 20. | J. R. Dupuy | 1887–1888 |
| 21. | Frank P. Kelly | 1888–1890 |
| 22. | James McLachlan | 1890–1892 |
| 23. | Henry C. Dillon | 1892–1894 |
| 24. | John C. Donnell | 1895–1899 |
| 25. | James C. Rives | 1899–1903 |
| 26. | J. D. Fredericks | 1903–1915 |
| 27. | Thomas L. Woolwine | 1915–1923 |
| 28. | Asa Keyes | 1923–1928 |
| 29. | Buron Fitts | 1928–1940 |
| 30. | John F. Dockweiler | 1940–1943 |
| 31. | Fred N. Howser | 1943–1946 |
| 32. | William E. Simpson | 1946–1951 |
| 33. | S. Ernest Roll | 1951–1956 |
| 34. | William B. McKesson | 1956–1964 |
| 35. | Evelle J. Younger | 1964–1971 |
| 36. | Joseph P. Busch | 1971–1975 |
| 37. | John Van de Kamp | 1975–1981 |
| 38. | Robert Philibosian | 1981–1984 |
| 39. | Ira Reiner | 1984–1992 |
| 40. | Gil Garcetti | 1992–2000 |
| 41. | Steve Cooley | 2000–present |
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