The Los Angeles Marathon (formerly known as the City of Los Angeles Marathon) is an annual running event typically held each spring in Los Angeles, California, since 1986. The marathon was inspired by the success of the 1984 Summer Olympic Games hosted in Los Angeles. It is one of the five largest marathons in the country, with 26,000 participants.

Since 2020, the event has been sponsored by Asics and is officially titled the Los Angeles Marathon presented by ASICS.

In 1970, a race of length 25 miles (40 km) was held in Los Angeles.

In 1971, the race was lengthened to the distance of a standard marathon – 26 miles 385 yards – and known as the "Griffith Park Marathon". It was held at the same time as the Municipal Games.

The 1972 race was known as the "Municipal Games Marathon", while races from 1973 to 1977 were known as the "Los Angeles Marathon", and the 1978 edition was known as the "Los Angeles Police Marathon".

The Association of Road Racing Statisticians (ARRS) has no record of any races in this series after 1978.

The inaugural race in 1981, known as the "Jordache Los Angeles Pro-Am Marathon", was run with two sections, a professional section with 100,000 USD in prize money, and an amateur section.

Both the 1982 and 1983 races were known as the "Los Angeles Lite Marathon".