Redondo Beach (Spanish for 'round') is a coastal city in Los Angeles County, California, United States, located in the South Bay region of the Greater Los Angeles area. It is one of three adjacent beach cities along the southern portion of Santa Monica Bay. The population was 71,576 at the 2020 census, up from 66,748 in 2010.

Redondo Beach was originally part of the 1785 Rancho San Pedro Spanish land grant that later became the South Redondo area. The primary attractions include Municipal Pier and the sandy beach, popular with tourists and a variety of sports enthusiasts. The western terminus of the Metro Rail C Line (formerly the Green Line) is in North Redondo Beach.

The Chowigna Indians used the site of today's Hopkins Wilderness Park, formerly Nike missile site LA-57 from 1956 to 1963, in Redondo Beach, California, as a lookout place. The wetlands located at the site of the AES power plant in Redondo Beach were a source of foods including halibut, lobster, and sea bass, and also of salt.

In the 1700s, the Chowigna bartered salt from the old Redondo Salt Lake, "a spring-fed salt lake about 200 yards [180 m] wide and 600 yards [550 m] long situated about 200 yards from the ocean", with other tribes. Their village by the lake was called "Onoova-nga", or "Place of Salt."

The Chowigna were relocated to missions in 1854, when Manuel Dominguez sold 215 acres (87 ha) of Rancho San Pedro, including the lake, to Henry Allanson and William Johnson for the Pacific Salt Works.

The city's residents and political leaders have long advocated to retire an aging waterfront power plant and allow it to be restored to its natural wetland state, rather than converted into a housing development. The city has also participated in legal proceedings to preserve its ability to participate in residential zoning decisions, including the discretion to regulate single-family homes from being transformed by for-profit developers into “six-on-a-lots.”

In 1983, the city of Redondo Beach adopted a resolution “recognizing the Goodyear Airship Columbia (aka Goodyear blimp) as the “Official Bird of Redondo Beach.”

In 2022, the Redondo Beach government (along with the governments of Torrance, Carson, and Whittier) sued the California state government, seeking to block the California HOME Act (SB 9), which permits the construction of duplexes and fourplexes on lots. Redondo Beach mayor Bill Brand has argued that there is no housing crisis in Redondo Beach.

In 2023, Redondo Beach sued to prevent the transformation of the lot of an aging waterfront power plant into a village-style complex of 2,700 residential units (including 540 affordable units) and commercial space. The mayor of Redondo Beach, Bill Brand, became mayor after spearheading an effort to block housing on the lot.

According to the United States Census Bureau, the city has a total area of 6.2 square miles (16 km2), over 99% of it land.

Redondo Beach was originally part of the 1784 Rancho San Pedro Spanish land grant of the 43,000-acre (170 km2) Dominguez Rancho that later became the ten-mile (16 km) ocean frontage of Rancho Sausal Redondo.

Redondo Beach has a warm-summer Mediterranean climate (Köppen climate classification: Csb) with mild winters and warm, almost rainless summers. The coldest months are December through March, and the warmest months are July through September. Redondo Beach has mild temperatures year round due to its coastal location.

The city is affluent and predominantly white.

The 2020 census found that greater than 50% of Redondo Beach’s residents are white, nearly double the rate of the greater Los Angeles area.

Redondo Beach, like its neighboring beach towns, has become one of the most exclusionary cities in Los Angeles by limiting housing production, resulting in a median home costing $1.4 million, 60% higher than the regional average for Los Angeles.

The 2010 United States Census reported that Redondo Beach had a population of 66,748. The population density was 10,751.1 inhabitants per square mile (4,151.0/km2). The racial makeup of Redondo Beach was 49,805 (74.6%) White (65.2% Non-Hispanic White), 1,852 (2.8%) African American, 291 (0.4%) Native American, 8,004 (12.0%) Asian, 199 (0.3%) Pacific Islander, 2,725 (4.1%) from other races, and 3,872 (5.8%) from two or more races. There were 10,142 residents of Hispanic or Latino ancestry, of any race (15.2%).

The Census reported that 66,317 people (99.4% of the population) lived in households, 367 (0.5%) lived in non-institutionalized group quarters, and 64 (0.1%) were institutionalized.

There were 29,011 households, out of which 7,825 (27.0%) had children under the age of 18 living in them, 12,507 (43.1%) were opposite-sex married couples living together, 2,515 (8.7%) had a female householder with no husband present, 1,207 (4.2%) had a male householder with no wife present. There were 1,904 (6.6%) unmarried opposite-sex partnerships, and 179 (0.6%) same-sex married couples or partnerships. 9,252 households (31.9%) were made up of individuals, and 2,145 (7.4%) had someone living alone who was 65 years of age or older. The average household size was 2.29. There were 16,229 families (55.9% of all households); the average family size was 2.94.

Redondo Beach had 12,887 people (19.3%) under the age of 18, 4,198 people (6.3%) aged 18 to 24, 23,149 people (34.7%) aged 25 to 44, 19,532 people (29.3%) aged 45 to 64, and 6,982 people (10.5%) who were 65 years of age or older. The median age was 39.3 years. For every 100 females, there were 99.1 males. For every 100 females age 18 and over, there were 97.2 males.

There were 30,609 housing units at an average density of 4,930.2 units per square mile (1,903.6 units/km2), of which 14,917 (51.4%) were owner-occupied, and 14,094 (48.6%) were occupied by renters. The homeowner vacancy rate was 0.9%; the rental vacancy rate was 5.3%. 36,796 people (55.1% of the population) lived in owner-occupied housing units and 29,521 people (44.2%) lived in rental housing units.

According to the 2010 United States Census, Redondo Beach had a median household income of $99,496, with 5.4% of the population living below the federal poverty line.

As of the census of 2000, there were 63,261 people, 28,566 households, and 15,254 families residing in the city. The population density was 10,065.4 inhabitants per square mile (3,886.3/km2). There were 29,543 housing units at an average density of 4,700.6 units per square mile (1,814.9 units/km2). The racial makeup of the city was 78.6% White, 9.1% Asian, 2.5% African American, 0.5% Native American, 0.4% Pacific Islander, 4.4% from other races, and 4.6, % from two or more races. Hispanic or Latino residents of any race were 13.5% of the population.

There were 28,566 households, out of which 23.3% had children under the age of 18 living with them, 40.6% were married couples living together, 9.0% had a female householder with no husband present, and 46.6% were non-families. 33.1% of all households were made up of individuals, and 5.9% had someone living alone who was 65 years of age or older. The average household size was 2.21 and the average family size was 2.87.

In the city, 18.8% of the population was under the age of 18; 6.1%, aged 18 to 24; 43.1%, aged 25 to 44; 23.6%, aged 45 to 64; and 8.5% aged 65 or older. The median age was 37 years. For every 100 females, there were 101.5 males. For every 100 females age 18 and over, there were 99.8 males.

According to a 2007 estimate, the median income for a household in the city was $93,274, and the median income for a family was $108,753. Males had a median income of $56,796 versus $45,204 for females. The per capita income for the city was $38,305. About 4.0% of families and 5.9% of the population were below the poverty line, including 6.2% of those under age 18 and 6.1% of those age 65 or over.

According to the city's 2020 Comprehensive Annual Financial Report, the top employers in the city are:

Redondo Beach's City Council elections are held on the first Tuesday after the first Monday in March of odd-numbered years after the City Attorney notified California's Secretary of State of not moving both its City Council and Board of Education elections to a statewide primary or general election starting in 2018. The elections are all-mail instead of in-person.

The current mayor and council members are:

The City of Redondo Beach is a charter city. Almost two thirds of the residents in Los Angeles County, the majority in Southern California, and a plurality of Californians live in charter cities according to the 2010 US Census. As a charter city, Redondo Beach can adopt amendments to its city charter.

In the California State Legislature, Redondo Beach is in the 24th Senate District, represented by Democrat Ben Allen, and in the 66th Assembly District, represented by Democrat Al Muratsuchi.

In the United States House of Representatives, Redondo Beach is in California's 36th congressional district, represented by Democrat Ted Lieu.

In the 2008 presidential election Barack Obama won 59% of the vote and John McCain won 37% of the vote.

The Redondo Beach Unified School District serves the city. Redondo Union High School is the zoned high school, with the adjoining campus of Patricia Dreizler Continuation High School located to the east of the Redondo Union High School main grounds serving as a continuation school. The Redondo Beach Learning Academy, a community day school houses 9th-12th graders, is located on the South Bay Adult School campus in Redondo Beach. Dreizler continues to be recognized as a California Model Continuation High School. The Independent Study Program supports grades 9-12 and is housed on the Patricia Deizler campus. Additionally, Redondo Beach has two middle schools, Adams Middle School and Parras Middle School. Adams Middle School, located in North Redondo Beach, primarily serves 6th to 8th grade students in the North Redondo area, with Parras Middle School being the designated middle school of South Redondo Beach. The city also has eight established elementary schools: Alta Vista, Beryl Heights, Birney, Jefferson, Lincoln, Madison, Tulita and Washington. All twelve schools are evenly divided throughout the North and South areas of Redondo Beach, with five elementary schools and one middle school located in North/Central Redondo Beach; and three elementary schools, one middle school, and the singular designated high school placed in South Redondo Beach. The Redondo Beach Educational Foundation was founded in 1992 and revitalized in 2008.

Residents of Redondo Beach were in South Bay Union High School District until 1993, when it dissolved.

Valor Christian Academy (formerly Coast Christian School) is in Redondo Beach.

The United States Postal Service operates the Redondo Beach Post Office at 1201 North Catalina Avenue, the Redondo Beach Station #2 Post Office at 1715 Via El Prado, the North Redondo Beach Post Office at 2215 Artesia Boulevard, and the Galleria Post Office at Suite 377D at 1815 Hawthorne Boulevard.

The Los Angeles County Department of Health Services operates the Torrance Health Center in Harbor Gateway, Los Angeles, near Torrance and serving Redondo Beach.

The Beach Cities Health District, one of 78 California Health Districts, is located in Redondo Beach. Created in 1955, as South Bay Hospital, to provide health and wellness services to the residents of Hermosa Beach, Manhattan Beach, and Redondo Beach. The district took on its current name in 1993. In 2002, Beach Cities Health District opened AdventurePlex, a Manhattan Beach fitness facility for youth and their families of the three beach cities. AdventurePlex has mazes, tunnels, outdoor rock climbing walls, complex ropes courses, and an indoor gymnasium.

The Redondo Beach Police Department was established in the 1920s. The Police Department consists of 90 sworn members (officers) plus 57 non-sworn members.

The first library in Redondo Beach began as a reading room in 1895. The first five-member Library Commission for the city was formed in November 1908. The library moved into the then City Hall's west wing in 1909 and eventually filled the entire west wing at 301 Emerald Street. In 1928 the Chamber of Commerce recommended a new library be built on the site previously occupied by the Hotel Redondo in what is now Veterans Park. The Veterans Park Library is a Spanish/Dutch colonial building designed by architect Lovel Bearse Pemberton and opened on July 2, 1930. It was placed on the National Register of Historic Places in 1981. After serving as the Main Library for the city for 60 years, a site adjacent to City Hall was identified for a new, modern Main Library building. The new Main Library for the City of Redondo Beach opened on July 8, 1995, at 303 N. Pacific Coast Highway. A North Branch Library was also established in 1930 and started at the Grant Community Hall, it then moved to its current location at 2000 Artesia Boulevard in 1949. A new North Branch Library was constructed on the site in 2009 and opened its doors on September 28, 2010. The North Branch Library is the first City owned Green building and received Gold LEED certification.

Redondo Beach is served by Beach Cities Transit and the Redondo Beach C Line station.

Historically, the city was served by the Santa Fe Railroad and Pacific Electric's Venice-Playa del Rey and Redondo Beach via Gardena lines.