State Route 94 (SR 94) in the U.S. state of California is the Martin Luther King Jr. Freeway from Interstate 5 in Downtown San Diego to the end of the freeway portion past Route 125 in Spring Valley; the non-freeway segment of SR 94 is Campo Road.

This route is part of the California Freeway and Expressway System and is eligible for the State Scenic Highway System. However, it is not a scenic highway as designated by Caltrans.

SR 94 is an east–west running freeway that connects the communities of downtown San Diego (becoming the one-way F Street at freeway's westbound terminus at 17th Street; eastbound traffic enters the freeway from the one-way G Street), southeast San Diego, Lemon Grove, La Mesa, Spring Valley, Casa de Oro. The route turns into a highway at Via Mercado in Rancho San Diego. Route 94 continues through Rancho San Diego by keeping right at the Jamacha Road and Campo Road intersection. The remainder of the route connects the communities of Jamul, Dulzura, Tecate, Potrero, Campo, and Boulevard. The route ends at the east end by connecting to Interstate 8.

Perhaps due to its namesake, this highway served as part of the route of the hearse that carried the body of Coretta Scott King from San Diego to Atlanta.[citation needed]

Prior to the 1990s construction of additional sections of Route 125 to the south of Route 94 and to the north of Interstate 8, the section of Route 125 between Route 94 and Interstate 8 was signed as part of Route 94 (even though both the sections of the current Route 94 west and east of Route 125 were also signed as Route 94). Signage at the interchange of Interstate 8 and Route 125 was later modified to add the Route 125 designation and a "TO" referring to the Route 94 signage (still present), while signs on the freeway itself were changed to Route 125 north and south, as appropriate. The signage changes were made shortly before the opening of the portion of Route 125 immediately north of Interstate 8. One relic of this alignment is that the primary traffic lanes of eastbound Route 94 lead to northbound Route 125, while southbound lanes of Route 125 lead to westbound Route 94, requiring the use of interchange ramps to continue on the route and direction prior to this interchange.

The highway was designated the Martin Luther King Jr. Freeway by the California state legislature in September 1989, after a 2-year struggle to find a suitable tribute to King in the San Diego area. The measure specified that the new signs must be paid for by private donations, and it was 10 years before all the signs were in place.

Except where prefixed with a letter, postmiles were measured on the road as it was in 1964, and do not necessarily reflect current mileage. The entire route is in San Diego County.