Yonkers (/ˈjɒŋkərz/) is a city in Westchester County, New York, United States. With a population of 211,569 at the 2020 census, it is the third-most populous city in New York state and the most populous city in Westchester County. Yonkers is classified as an inner suburb of New York City, immediately north of the Bronx and approximately 2.4 miles (4 km) north of Marble Hill (the northernmost point in Manhattan).

Yonkers is a centrally located municipality within the New York metropolitan area. Downtown Yonkers is centered around Getty Square, where the municipal government is located. The downtown area, which also houses local businesses and nonprofit organizations, is a retail hub for the city and the northwest Bronx. Major shopping areas are in Getty Square on South Broadway, at the Cross County Shopping Center and the Ridge Hill Mall, and along Central Park Avenue.

The city has a number of attractions, including Tibbetts Brook Park, Untermyer Park and Gardens, the Hudson River Museum, the Saw Mill River, the Science Barge, Sherwood House, and access to the Hudson River. Yonkers is also known as the City of Seven Hills: Park, Nodine, Ridge, Cross, Locust, Glen, and Church Hills. The city has continued to experience significant gentrification since the inception of the 21st century.

The area was granted to Adriaen van der Donck, the patroon of Colen Donck, in July 1645. Van der Donck was known locally as Jonkheer, 'young gentleman', an honorific title derived from the Dutch jonk, 'young', and heer, 'lord'. The title, similar to esquire, is linguistically comparable to the German Junker. Jonkheer was shortened to Jonker (possessive Jonkers), from which the name Yonkers derives. The city's residents are known as Yonkersonians, Yonkersites, Yonkers, or Yonks.

The indigenous Native American village of Nappeckamack was located near the Neperah stream (now the Saw Mill River, also known as Nepperhan Creek), which flowed into the Shatemuck (Hudson River). The land on which the city is built was once part of Colen Donck, a 24,000-acre (97-square-kilometer) Dutch land grant. It ran 12 miles (19 km) north from the present-day Manhattan–Bronx border at Marble Hill, and from the Hudson River east to the Bronx River.

Adriaen van der Donck (d. 1655) built a saw mill near the confluence of Nepperhan Creek and the Hudson River. Near the site of Van der Donck's mill is the Philipse Manor Hall State Historic Site, a manor house owned by Dutch colonists. The historic house museum is also an archive. The original structure was built by white workers and enslaved people for Frederick Philipse and his wife, Margaret Hardenbroeck de Vries, around 1682. Philipse was a wealthy Dutchman who, at his death, had amassed an estate which included present-day Yonkers and several other Hudson River towns. Philipse's great-grandson, Frederick Philipse III, was a prominent loyalist during the American Revolution who had economic and political ties to English businesspeople. Because of his political leanings, he fled to England. American colonists in New York State confiscated and sold all lands and property belonging to the Philipse family.

Yonkers has undergone several changes to neighborhoods in an effort to revitalize the city, which has included gentrification. Changes were made to its waterfront, which included revitalizing its green space.

Residents of the western area of downtown Yonkers opposed the Pierpointe, a condominium-complex development proposal that would build over 1,900 condominiums (including six 38-story towers), during the 1980s struggle against segregation. According to critics, the development would bring homelessness and gentrification to the area.