California State Route 90

State Route 90 (SR 90) is an east-west state highway in the U.S. state of California that consists of non-contiguous segments in Greater Los Angeles. The highway was initially planned to connect southwestern Los Angeles and Anaheim Hills, but a gap in the route exists from Culver City to La Habra due to community opposition to its construction.

Most of the constructed western portion of SR 90 is the Marina Freeway, a short freeway in southwestern Los Angeles and the nearby suburbs, linking Marina del Rey. It begins at Lincoln Boulevard (State Route 1) near Marina del Rey as the Marina Expressway. It then goes past a few intersections before becoming the Marina Freeway. It then continues eastward approximately along the border between the Del Rey and Westchester neighborhoods of the city of Los Angeles before terminating in Slauson Avenue in southern Culver City to just past Culver Boulevard.

The eastern portion of SR 90 runs along Imperial Highway between Beach Boulevard (State Route 39) in La Habra and State Route 91 in Anaheim Hills, also passing through Fullerton, Brea, Placentia, and Yorba Linda. Though some maps and signs may still mark SR 90 as continuous through the city of Yorba Linda, control of the segment within the city was relinquished to that local jurisdiction in 2002 and is thus no longer officially part of the state highway system. The portion of the road in Yorba Linda between Esperanza Road and Yorba Linda Boulevard is built to freeway standards; the city renamed it the Richard M. Nixon Freeway in honor of the 37th President of the United States, Richard Nixon, who was born in Yorba Linda less than half a mile away from the road.