California's 29th senatorial district is one of 40 California State Senate districts.

It is currently represented by Democrat Eloise Reyes of Grand Terrace.

The district straddles the intersection of three counties: Los Angeles, Orange, and San Bernardino.

Centered on the Chino Hills and the northern Santa Ana Valley, it includes arms extending into the unincorporated community of Ramona in the north and the city of Cypress in the west.

Los Angeles County – 1.7% Orange County – 22.7% San Bernardino County – 3.7%