| Article | Location | Date | Number killed | Number injured | Description |
|---|
| Leung Ying | Fairfield | 1928-08-22 | 11 | 4 | Shooting spree at former workplace |
| 1965 Highway 101 sniper attack | Orcutt (nearby) | 1965-04-25 | 4 | 10 | Teenager shot at cars on highway |
| William Ray Bonner | Los Angeles | 1973-04-22 | 7 | 9 | Shooting spree |
| California State University, Fullerton massacre | Fullerton | 1976-07-12 | 7 | 2 | Workplace violence |
| Cleveland Elementary School shooting (San Diego) | San Diego | 1979-01-29 | 2 | 9 | School shooting |
| Tyrone Mitchell | Los Angeles | 1984-02-24 | 3 | 12 | School shooting |
| San Ysidro McDonald's massacre | San Ysidro | 1984-07-18 | 23 | 19 | Deadliest US mass shooting at time |
| Sunnyvale ESL shooting | Sunnyvale | 1988-02-16 | 7 | 4 | Stalking/workplace violence |
| Cleveland Elementary School shooting (Stockton) | Stockton | 1989-01-17 | 6 | 32 | School shooting |
| Ramon Salcido | Sonoma | 1989-04-14 | 7 | | Domestic violence; familicide |
| Dana Ewell | Fresno | 1992-04-19 | 3 | | Murder for hire for financial gain |
| Lindhurst High School shooting | Olivehurst | 1992-05-01 | 4 | 10 | School shooting |
| Lynwood Drake | Paso Robles/Morro Bay | 1992-11-07 | 7 | 2 | Shooting spree |
| 101 California Street shooting | San Francisco | 1993-07-01 | 9 | 6 | Attack on a law firm. |
| North Hollywood shootout | North Hollywood | 1997-2-28 | 2 | 20 | Bank robbery and subsequent shootout |
| Los Angeles Jewish Community Center shooting | Granada Hills and Chatsworth | 1999-08-10 | 1 | 5 | anti-Semitic terrorist attack by Aryan Nations member |
| 2001 Nevada County shootings | Nevada County | 2001-01-10 | 3 | 3 | Shooting spree |
| Santana High School shooting | Santee | 2001-03-05 | 2 | 13 | School shooting |
| Marcus Wesson | Fresno | 2004-03-12 | 9 | | Domestic violence; familicide |
| Goleta postal facility shootings | Goleta | 2006-01-30 | 8 | | Workplace violence |
| Covina massacre | Covina | 2008-12-24 | 10 | | Domestic violence |
| 2011 Seal Beach shooting | Seal Beach | 2011-10-12 | 8 | 1 | Mass shooting at a hair salon |
| Southern California Edison shooting | Irwindale | 2011-12-16 | 3 | 2 | Workplace shooting, power company |
| 2012 Oikos University shooting | Oakland | 2012-04-02 | 7 | 2 | School shooting |
| 2012 Anaheim, California police shooting and protests | Anaheim | 2012-07-21 | 2 | 6 | Protests after police officer killings |
|
| Fresno meat plant shooting | Fresno | 2012-11-6 | 3 | 2 |
| Christopher Dorner shootings and manhunt | Los Angeles (and nearby) | 2013-02-3 to 2013-02-12 | 5 | | Attack on the police |
| 2013 Santa Monica shootings | Santa Monica | 2013-06-07 | 6 | 2 | School shooting |
| Salinas taqueria shooting | Salinas | 2013-06-07 | 3 | 4 | Gang-related fight and shooting |
| 2014 Isla Vista killings | Isla Vista | 2014-05-23 | 6 | 14 | Shooting spree |
| Shootings of Sacramento County law enforcement officers | Sacramento | 2014-10-24 | 2 | 2 | Shooting of Sacramento County sheriff's deputies |
| 2015 San Bernardino attack | San Bernardino | 2015-12-02 | 16 | 24 | Islamic Terrorist attack at the workplace. |
| 2017 Fresno shootings | Fresno | 2017-04-18 | 4 | | African-American man targeted White victims at several locations. |
| Rancho Tehama shootings | Rancho Tehama | 2017-11-13 to 2017-11-14 | 6 | 18 | Shooting spree across 8 locations |
| Thousand Oaks shooting | Thousand Oaks | 2018-11-07 | 13 | 16 | Mass shooting at a restaurant |
| Tulare County shootings | Tulare County | 2018-12-16 | 3 | 7 | Shooting spree in several locations |
| Poway synagogue shooting | Poway | 2019-04-27 | 1 | 3 | Antisemitic terrorist attack inspired by the Pittsburgh synagogue shooting and the Christchurch mosque shootings. |
| Gilroy Garlic Festival shooting | Gilroy | 2019-07-28 | 4 | 12 | Mass shooting |
| Orinda shooting | Orinda | 2019-10-31 | 5 | 4 | Mass shooting that occurred during a house party. |
| 2019 Saugus High School shooting | Santa Clarita | 2019-11-14 | 2 | 5 | School shooting |
| 2019 Fresno shooting | Fresno | 2019-11-17 | 4 | 6 | A group of family and friends were gathered in a backyard Sunday to watch a football game when two gunmen sneaked into the yard and began shooting. |
| 2020 boogaloo murders | Oakland | 2020-05-30 | 2 | 3 | Attacks on law enforcement during the George Floyd protests. |
| Aguanga shooting | Aguanga | 2020-09-07 | 7 | | Unsolved case, investigated by police if related to a marijuana grow |
| 2021 San Jose shooting | San Jose | 2021-05-26 | 10 | | Mass shooting; workplace violence |
| 2022 Sacramento shooting | Sacramento | 2022-04-03 | 6 | 12 | Mass shooting; Gang War |
| 2022 Laguna Woods shooting | Laguna Woods, California | 2022-05-15 | 1 | 5 | Hate crime at a church. |
| 2022 Oakland school shooting | Oakland | 2022-09-28 | 1 | 5 | Mass shooting, unsolved and alleged by police to be gang-related. |
| 2022 Oakland party shooting | Oakland | 2023-01-16 | 2 | 2 | Two juveniles held. |
| 2023 Goshen shooting | Goshen | 2023-01-16 | 6 | 0 | Unsolved alleged cartel massacre at a house. |
| 2023 Monterey Park shooting | Monterey Park | 2023-01-21 | 12 | 9 | Mass shooting during Lunar New Year celebrations |
| 2023 Half Moon Bay shootings | Half Moon Bay | 2023-01-23 | 7 | 1 | Workplace violence at two farms. |
| 2023 Trabuco Canyon shooting | Trabuco Canyon, California | 2023-08-23 | 4 | 6 | Mass shooting at bar, gunman targeted his ex-wife |
