Sunset Boulevard is a boulevard in the central and western part of Los Angeles, California, United States, that stretches from the Pacific Coast Highway in Pacific Palisades east to Figueroa Street in downtown Los Angeles. It is a major thoroughfare in the cities of Beverly Hills and West Hollywood (including a portion known as the Sunset Strip), as well as several districts in Los Angeles.

Approximately 23.6 miles (38 km) in length, the boulevard roughly traces the arc of mountains that form part of the northern boundary of the Los Angeles Basin, following the path of a 1780s cattle trail from the Pueblo de Los Ángeles to the ocean.

From Downtown Los Angeles, the boulevard heads northwest, to Hollywood, through which it travels due west for several miles before it bends southwest towards the ocean. It passes through or near Echo Park, Silver Lake, Los Feliz, Hollywood, West Hollywood, Beverly Hills, and Holmby Hills. In Bel Air, Sunset Boulevard runs along the northern boundary of UCLA's Westwood campus. The boulevard continues through Brentwood to Pacific Palisades, where it terminates at the Pacific Coast Highway intersection.

The boulevard has curvaceous winding stretches, and can be treacherous for unalert drivers in some sections. Sunset Boulevard is at least four lanes wide along its entire route. Sunset is frequently congested with traffic loads beyond its design capacity.

Sunset Boulevard historically extended farther east than it does now, starting at Alameda Street near Union Station and beside Olvera Street in the historic section of Downtown. The portion of Sunset Boulevard east of Figueroa Street was renamed Cesar Chavez Avenue in 1994, along with Macy Street and Brooklyn Avenue, in honor of the late Mexican-American union leader and civil rights activist.

In 1877, Harvey Henderson Wilcox, one of the earlier real estate owners from "back East", decided to subdivide more than 20 acres (8.1 ha) of land (mostly orchards and vineyards) along Sunset Boulevard, including what is today Hollywood and Vine.

In 1890, Belgian diplomat Victor Ponet bought 240 acres (97 ha) of the former Rancho La Brea land grant. His son-in-law, Francis S. Montgomery, inherited this property and created Sunset Plaza.^{[irrelevant citation]}

Originally, Sunset Boulevard only extended from Hollywood in the west to Marion Avenue in the Echo Park district in the east. The Board of Public Works proposed to extend Sunset east to Main Street in the Plaza by routing the road over the existing section of Bellevue Avenue, but the plan was delayed until approximately 1904, due to active opposition by affected land owners. According to the 1910 Baist Real Estate Survey Atlas, Sunset Boulevard reached the Plaza by that time, but it did so by two short and narrow segments which were not aligned with each other and thus did not provide a proper thoroughfare to it. In late 1912, several properties along the route were condemned so that the boulevard could be changed in both its width and its alignment. With these changes completed, Sunset Boulevard now reached North Main Street and continued as Marchessault along the northern end of the Plaza.