Proposition 2 was a California ballot proposition in that state's general election on November 4, 2008. It passed with 63% of the votes in favor and 37% against. Submitted to the Secretary of State as the Prevention of Farm Animal Cruelty Act, the initiative's name (as with others such as Proposition 8) was amended to officially be known as the Standards for Confining Farm Animals initiative. The official title of the statute enacted by the proposition is the Prevention of Farm Animal Cruelty Act.

The proposition adds a chapter to Division 20 of the California Health and Safety Code to prohibit the confinement of certain farm animals in a manner that does not allow them to turn around freely, lie down, stand up, and fully extend their limbs. The measure deals with three types of confinement: veal crates, battery cages, and sow gestation crates.

Having been passed by the voters on November 4, 2008, the key portion of the statute will become operative on January 1, 2015. Farming operations have until that date to implement the new space requirements for their animals, and the statute will prohibit animals in California from being confined in a proscribed manner thereafter.