Viña del Mar (Spanish pronunciation: [ˈbiɲa ðel ˈmaɾ]; meaning "Vineyard of the Sea") is a city and commune on central Chile's Pacific coast. Often referred to as La Ciudad Jardín ("The Garden City"), Viña del Mar is located within the Valparaíso Region, and it is Chile's fourth largest city with a population of 324,836 (according to the 2008 census). Viña del Mar is also part of the Greater Valparaíso area, the country's second largest metropolitan area (pop. 935,602, 2017 census), after the Metropolitan area of Santiago.

The valley where Viña del Mar was founded was known as the valley of Peuco by the Changos, native inhabitants of the area dedicated to fishing. ^{[citation needed]} With the arrival of the Spanish conquistadores the valley was divided into two large haciendas. North of the Marga Marga creek up to the current location of Reñaca, Viña del Mar, and to the south up to the current Cerro Barón (Baron Hill), the Hacienda Las Siete Hermanas (The Seven Sisters).

Francisco Javier Alvares authorized the construction of a railroad through his lands to join Santiago and the port of Valparaíso. The arrival of the railroad brought a young engineer Jose Francisco Vergara who married Francisco Javier Alvares's granddaughter, Mercedes Alvares. It was José Francisco Vergara who instigated the idea of the creation of a new city independent of Valparaíso. ^{[citation needed]}

The establishment of Refinadora de Azúcar de Viña del Mar (Sugar Refining Company), CRAV in 1873 and the foundation of the Lever, Murphy & Co. by the British Richard Lever and William Murphy in 1883, that gave the necessary economic impulse to transform the young city into one of the most important cities of Chile. The building of a military installation, Regimiento Coraceros in 1917, naval facilities in Las Salinas, and the housing of military and naval personnel furthered the city's growth. That year, also, a seaside villa was rebuilt as what is known today as Wulff Castle.

In 1925, the Teatro Municipal was opened in its current location in the eastern front of the city's downtown square, Plaza de Viña del Mar. In 1928 president Carlos Ibáñez del Campo authorized the creation of a casino, securing the future and the touristy character of the city. The Casino Municipal de Viña del Mar was opened on 31 December 1930. On 31 January 1931 the Presidential Palace was inaugurated in Cerro Castillo (Castle Hill) as a summer residence for the Chilean President. The touristy character of the city was furthered with the inauguration of the O'Higgins Hotel in 1936 and the inauguration of the Miramar Hotel by Caleta Abarca Beach in 1945. For a few years in the early 1960s, a trolleybus line connected the city with Valparaíso, and the electric route network included three branches within Viña.

Viña del Mar was one of the four host cities of the 1962 football (soccer) World Cup. It is now home to CD Everton, a soccer team in the Chilean Premier division, which took its name from the English team.

According to the 1982 movie, Missing and other sources, Viña del Mar was focal point for the plotters of the 1973 Chilean coup d'état.

Viña del Mar was declared a sister city of Sausalito, California (a city north of San Francisco), in 1971. To demonstrate the sister city relationship, you can find a square (plaza) called "Viña del Mar" in downtown Sausalito, and a "Sausalito" stadium and "Sausalito" lagoon in Viña del Mar. Viña del Mar is also a sister city of Mar del Plata, Argentina since 1993. ^{[citation needed]}