California's 24th senatorial district is one of 40 California State Senate districts.

It is currently represented by Democrat Ben Allen of Santa Monica.

The district encompasses the Westside Los Angeles neighborhoods of Venice, West Los Angeles, Pacific Palisades, Brentwood, Bel Air, Century City, Sunset Strip, Laurel Canyon, Hollywood, and Miracle Mile; and the Santa Monica Mountains cities such as Hidden Hills, Calabasas, Topanga, and Malibu.

In addition, the district includes most of the South Bay cities of Los Angeles County, including Rancho Palos Verdes, Rolling Hills, Torrance, Redondo Beach, Manhattan Beach, El Segundo, Marina del Rey, Santa Monica, Beverly Hills, and West Hollywood.