Elk Grove is a city in Sacramento County, California, United States. Located just south of the state capital of Sacramento, it is part of the Sacramento metropolitan area. As of the 2020 Census, the population of the city was 176,124. A 2024 Census estimate puts the population of the city at 182,797. Elk Grove has many wineries, wine cellars, and vineyards. Elk Grove was the fastest-growing city in the U.S. between July 1, 2004, and July 1, 2005, and is also presently the second-largest city in Sacramento County by population.

It is a general law city with a council/manager form of government. One of Elk Grove's largest employers is the Elk Grove Unified School District, which is the city's second-largest employer.

The Miwoks, a Native American tribe, once inhabited the area until the Westward Expansion of the United States, in which the Miwoks were relocated to reservations. In 1808, Spanish explorer Gabriel Moraga entered the region, naming the valley "Sacramento Valley" in honor of Sacramento, the "Holy Sacrament" in Spanish, giving the northerly city of Sacramento its name. A writer on Moraga's expedition wrote of the region:

Canopies of oaks and cottonwoods, many festooned with grapevines, overhung both sides of the blue current. Birds chattered in the trees and big fish darted through the pellucid depths. The air was like champagne, and (the Spaniards) drank deep of it, drank in the beauty around them.

Elk Grove was founded in 1850 as a stage stop for travelers coming from Sacramento and the San Francisco Bay Area, when the Elk Grove Hotel and Stage Stop was opened by James Hall, and the town was named after it. He named the area Elk Grove because he found elk horns in nearby tree groves, and he lived in a town of the same name in the state of Missouri. In 1868, the Western Division of the Central Pacific Railroad came through about a mile east of Elk Grove. At this new location, another hotel was built to accommodate travelers and was named the Elk Grove Hotel.

In the following decades, Elk Grove remained a small farming community with little urban development. In the late 1980s, suburban development projects began to arise around the community, specifically in the north near Sacramento. These were meant to serve Sacramento's population, as well as San Francisco commuters seeking a commuting community relatively near the San Francisco Bay Area where they could reside. Such changes triggered a period of rapid growth. On July 1, 2000, Elk Grove incorporated as a city. The city's growth peaked in 2004 and 2005, when Elk Grove was declared the fastest growing city in the US.

Apple Inc. manufactured its iMac line in Elk Grove as late as 2002. After many of those tasks were offshored in 2004, the facility was converted into the modern Apple Elk Grove campus. In 2018, Apple invested $4.2 million into expanding the office space, expanding its already established AppleCare support presence in the region.

In 2008, Elk Grove suffered heavily from the subprime mortgage crisis due to its suburban nature.