In California, you have the right to defend yourself — and self-defense is a complete defense to charges like assault and battery.
Once you raise it, the prosecution has to prove your actions were not justified.
The Rule
Self-defense is lawful when you reasonably believed you were in imminent danger of being harmed, you believed force was necessary to stop it, and you used no more force than reasonably necessary. The same applies to defense of others — stepping in to protect someone else from an imminent threat.
No Duty to Retreat
California does not require you to retreat before defending yourself. If you are somewhere you have a right to be, you may stand your ground and even pursue an assailant if reasonably necessary to protect yourself. This is why bystanders who intervene — and get charged — often have a strong defense.
The Limits
The force must be proportional to the threat, and the danger must be imminent — not past (that is retaliation) and not merely feared in the abstract. Someone who started the fight generally cannot claim self-defense unless they clearly withdrew. Where the facts fit, though, self-defense is one of the strongest positions in a criminal case.
Frequently Asked Questions
When is self-defense legal in California?
When you reasonably believed you were in imminent danger of harm, believed force was necessary to stop it, and used no more force than reasonably necessary. The same rules apply to defending another person from an imminent threat.
Do you have a duty to retreat in California?
No. California does not require you to retreat before defending yourself. If you are somewhere you have a right to be, you may stand your ground and even pursue an assailant if reasonably necessary to protect yourself.
Who has to prove self-defense?
Once self-defense is raised, the prosecution must prove beyond a reasonable doubt that your actions were not justified. It is a complete defense to charges like assault and battery, which is why it is one of the strongest positions in a case.
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Ahmed S. Hasan
San Francisco Criminal Defense Attorney · State Bar of California #364992
Ahmed S. Hasan is the founder of ASH Legal, a solo criminal defense practice based in San Francisco. The firm runs on flat-fee representation: one lawyer, one fee, from arraignment through resolution. No hourly billing. No surprise invoices.
Ahmed is a graduate of Emory University School of Law and a member in good standing of the State Bar of California (Bar #364992). His practice focuses on San Francisco misdemeanor defense — DUI, domestic violence, petty theft and shoplifting, drug possession, vandalism, trespassing, and assault and battery — with particular attention to diversion-track outcomes that end in dismissal under PC 1001.95, PC 1001.36 (Mental Health Diversion), PC 1001.80 (Military Diversion), and PC 1001.83 (Parental Caregiver Diversion).
Ahmed previously served as a post-bar clerk with the San Francisco Public Defender's Office, the city's largest indigent-defense practice. He is a member of the Asian Pacific American Bar Association of Silicon Valley.
He represents clients at the San Francisco Hall of Justice (850 Bryant Street) and the Civic Center Courthouse. The ASH Legal office is at 15 Boardman Place, Suite 301, San Francisco, CA 94103.
Free 30-minute consultations are available by phone or Zoom. (510) 545-6515 · ahmed@ashlegal.com