Redlands (/ˈrɛdləndz/ RED-ləndz) is a city in San Bernardino County, California, United States. As of the 2020 census, the city had a population of 73,168, up from 68,747 at the 2010 census. The city is located in Greater Los Angeles approximately 70 miles (110 km) northwest of Indio and 63 miles (101 km) east of Los Angeles.

Redlands was founded in 1881 on land that encompassed native Serrano, Morongo and Cahuilla tribes. Redlands absorbed the communities of Terracina, Idlewild, Plaza, Chicago Colony, Victoria, Barton, Gladysta, and Lugonia along with portions of Mentone, Crafton and Bryn Mawr when it incorporated in 1888. Redlands is home to the Asistencia Mission founded in 1819 by early European settlers. By the early 20th century, it was a major focal point of California's citrus industry and boasted the largest producer of navel oranges in the world.

Throughout its past, Redlands has a history of philanthropic residents establishing lasting legacies. The Smiley Library in 1898, the University of Redlands in 1907, the Redlands Bowl in 1924, the Lincoln Memorial Shrine in 1932, the Redlands Bicycle Classic in 1985 and the Garner Holt Foundation's "Garner's Garage" for animatronic STEM education and research established in 2024.

Today, Redlands is a strong growing community with a diverse economy, and growing population in the Inland Empire region of Southern California. Redlands is home to Esri, Citrus Plaza, the Redlands Historical Glass Museum and the San Bernardino County Museum.

The area now occupied by Redlands was previously part of the territory of the Morongo and Aguas Calientes tribes of Cahuilla people. Explorations such as those of Pedro Fages and Francisco Garcés sought to extend Catholic influence to the indigenous people and the dominion of the Spanish crown into the area in the 1770s. The Tongva village of Kaawchama, located just to the west of present-day Redlands, was visited by Fr. Francisco Dumetz in 1810, and was the reason the site was chosen for a mission outpost. Dumetz reached the village on May 20, the feast day of Saint Bernardino of Siena, and thus named the region the San Bernardino Valley. The Franciscan friars from Mission San Gabriel established the San Bernardino Estancia in 1819 and embarked on the usual program of training the native tribes to raise crops and mandating permanent settlements. By 1820, a ditch, known as a zanja, was dug by conscripted native labor for the friars from Mill Creek to the Estancia. In 1822, word of the Mexican triumph in the War of Independence reached the inland area, and lands previously claimed by Spain passed to the custody of the newly established Mexican government.

In 1842, the Lugo family bought the Rancho San Bernardino Mexican land grant and this became the first fixed settler civilization in the area. The current northwest area of Redlands, that astrides the Santa Ana River, was founded as Lugonia. The region was part of Alta California, a Mexican federal province until 1848, when it became part of the United States after the Mexican-American War. By 1850, California as a US state was established. The area received its first Anglo inhabitants in the form of several hundred Mormon pioneers, who purchased the entire Rancho San Bernardino, founded nearby San Bernardino, and established a prosperous farming community watered by the many lakes and streams of the San Bernardino Mountains. The Mormon community left wholesale in 1857, recalled to Utah by Brigham Young during the tensions with the US federal government that ultimately led to the brief Utah War. Benjamin Barton purchased 1,000 acres (4 km²) from the Latter-Day Saints and planted extensive vineyards and built a winery.

Lugonia attracted settlers including, Barry Roberts in 1869, followed a year later by the Craw and Glover families. "The first school teacher in Lugonia, George W. Beattie, arrived in 1874—shortly followed by the town's first negro settler, Israel Beal." Charles Nordhoff's 1873 book, "California: for Health, Pleasure, and Residence" was published. Nordhoff noted the regions warm winters and abundance of land. It attracted many people to Lugonia suffering from tuberculosis, among other ailments seeking health benefits in a dry climate, and available lands for sale. "The first settler on the site of the present Redlands is recorded to have erected a hut at the corner of what is now Cajon St. and Cypress Ave.; he was a sheep herder, and the year, 1865," reported Ira L. Swett in "Tractions of the Orange Empire".

In the 1880s, the arrival of the Southern Pacific and Atchison, Topeka and Santa Fe Railroads, connecting Southern California to San Francisco and Salt Lake triggered a land boom, with speculators such as John W. North flooding the area now known as the Inland Empire. The Redlands Colony was soon established by Frank E. Brown, a civil engineer, and E. G. Judson, a New York stock broker, to provide a center (along with John W. North's nearby settlement of Riverside) for the burgeoning citrus industry. They named their area, just south of Lugonia, "Redlands" after the color of the adobe soil. So large had the area grown by 1888 that it was decided to incorporate all the local towns into one city. "A red-letter day in the Annals of Redlands", pronounced Scipio Craig, editor of The Citrograph newspaper, of the November 26 incorporation. The original townships of Lugonia, Bryn Mawr, Barton, Terracina, Victoria, Gladysta, parts of Mentone, and parts of Crafton were mended into one incorporated city. The newspaper was first published in July 1887 by The Citrograph Printing Company, which remains in 2025 as both Redlands' oldest business and the longest-operating printing company in California. E. G. Judson served as the first mayor of Redlands.