Proposition 27 is a petition about the legalization of online gambling that was placed on the November ballot after it garnered enough signatures.

If passed, the proposition would allow licensed Native American tribes and gambling companies to offer online sports betting to those over 21 years old on non-tribal lands. The proposition would amend the California Constitution and state law to legalize online sports betting by Sept. 2023, allowing bets on professional sports games and some non-athletic events. The state would gain revenue from a share of sports bets made and use the funding to address homelessness and support regulatory costs (including operating a new state unit to regulate online sports betting).

If Proposition 27 is voted down, sports betting would continue to be illegal in California. State gambling and enforcement laws would stay the same. Some forms of gambling are currently allowed under state law, such as tribal gambling, the state lottery, cardroom betting and horse racing betting.