California's 38th senatorial district is one of 40 California State Senate districts.

It is currently represented by Democrat Catherine Blakespear of Encinitas.

The district encompasses the coastal North County region of San Diego County, including the communities of La Jolla, Del Mar, Solana Beach, Cardiff, Rancho Santa Fe, Encinitas, Carlsbad, Vista, Oceanside, San Luis Rey, and Camp Pendleton Marine Corps Base; along with the southern edge of Orange County, including San Clemente, San Juan Capistrano, Ladera Ranch, Las Flores, and Rancho Santa Margarita.