Байс: Город у залива и сахарных плантаций Филиппин.

Component city in Negros Oriental, Philippines

Bais, officially the City of Bais (; ), is a 3rd class component city in the province of Negros Oriental, Philippines. According to the 2020 census, it has a population of 84,317 people.

In the early days of Spanish exploration, some Spaniards came upon a swampy land and docked their boats at the vicinity of the two small islets that guarded the village. While exploring the place, they saw natives fishing along the coast. The Spaniards approached the natives and asked for the name of the place. The natives could not understand Spanish, and believing that the Spaniards were asking for the name of their catch, the natives answered saying "Ba is"; from that day on, this swampy valley of the Old Panlabangan and Talamban Hills became known as Bais.

Located from the provincial capital Dumaguete, it has a land area of There are two bays in the area, hence the name "Bais." The shore line is mostly mangroves, which are in danger of destruction due to the increasing population. The richness of marine life in the bays is because of these mangroves. Bais’s name is derived from the Visayan word "ba is" for brackish water eel – a fish species native to the city and one which has become the city's delicacy. A former barrio and later a municipality, Bais, officially became a city on September 9, 1968 (R. A. No. 5444). The territorial jurisdiction of Bais includes two islets (Olympia and Dewey) and the Bais Bay. The Bais Bay area holds a diversity of animal life and is a rich breeding and fishing ground for demersal and other fish species, and also invertebrates. South Bais Bay is also famous for dolphin watching. The Pelarta River runs beside the city center. There is, however, a dispute that the name Bais was taken after the eels locally called "bais" that used to thrive in this river. The river has been the source of irrigation water for the nearby sugar farms. This has been vital in the success of sugar plantations in this area. This river also has a big influence on the city's geography, as it deposits sediments in the former mangrove areas during the (formerly annual) flood season. These former mangrove swamps have now dried out and become populated with residents. In the late 1970s, under the Genaro Goñi administration, a river control system stretching from the city center toward the low lying areas was established in order to lessen flooding during the rainy season.

Bais is politically subdivided into 35 barangays. Each barangay consists of puroks and some have sitios.

Bais is the largest producer of raw sugar in Negros Oriental. There are two sugar mills in the city. The Central Azucarera de Bais was established by Tabacalera of Spain in the early 1918 and is the oldest in the country. The other mill is URSUMCO (Universal Robina Sugar Milling Corporation) which was formerly known as UPSUMCO (United Planters Milling Corporation) and constructed in the mid 1970s by Marubeni Corporation of Japan as a project of Ignacio Montenegro (also of Spanish roots). An ethanol plant of the Universal Robina Corporation (URC) that produces bioethanol for the local market has recently been inaugurated.

An annual fiesta is held each year on September 10 in honor of the city's patron saint San Nicolás de Tolentino, a celebration inherited from the Spanish era. On this occasion, most of the residents prepare food for anyone who visits a tradition practiced not only in Bais but also in most towns and cities in the Philippines. Lately, the celebration has included mardigras and parades. Seventy three percent of the city's total land area is devoted to agriculture and the local economy is dominated by agricultural activities and output. The existing urban area in the city covers only 109.12 hectares. Sugar is the major commercial crop in the city. About 36% of the city's agricultural land is planted in sugarcane, yielding 1.16 million gross kilograms annually for the domestic and foreign markets. Bais is also home to two sugar mills or centrals: Central Azucarera de Bais and URSUMCO. Fish production is the city's second income earner, with about 428 hectares of the land area devoted to fishpond development and operation and fish culture. Bangus (milkfish) culture is the dominant activity. In 2000, the bangus yield in the city was at 722 tons. The government of Bais operates ecotourism activities in the city, highlighted by whale and dolphin watching and nature treks. Two annual Bais festivals have also become tourism events: the Hudyaka sa Bais Mardigras (which was changed to Sipong Festival and later on changed back to Hudyaka) and the Christmas Festival (which showcases the city's, perhaps the province's only, giant rotating Christmas tree and colorful decors) since 1950. A concern of the city is its liquid and solid waste management. At present, liquid wastes are emptied directly without treatment into the Bais basin. The current dump site for solid waste is due for closure, and site development for a new 12.5 hectare sanitary landfill is being finalized. Bais is reported to be the last stronghold of the Spanish language in the Philippines, since some of the Spaniards are in the first settlement area of Negros, (and southeast of Bais) Tanjay.

The public schools in Bais are administered by the Schools Division of Bais City.