1 California

1 California, California One, 1st California, California First, or variant thereof, may refer to:
 * 1 California (bus line), a trolleybus line in San Francisco
 * One California, San Francisco office building
 * One California Plaza, Los Angeles office building
 * OneCalifornia Bank, bank
 * OneCalifornia, political opposition group to Six Californias

California 1 may refer to:
 * California State Route 1

1st California may refer to:
 * First California Mortgage
 * California Battalion
 * 1st California Infantry
 * 1st Regiment California Volunteer Cavalry
 * 1st California Veteran Infantry Battalion
 * 1st Battalion of Native Cavalry, California Volunteers

California 1st may refer to:
 * California's 1st district (disambiguation)
 * California's 1st congressional district
 * California's 1st State Assembly district
 * California's 1st State Senate district