Passi, officially known as the City of Passi (Kinaray-a: Syudad kang Passi/Syudad ka Passi; Hiligaynon: Dakbanwa sang Passi; Filipino: Lungsod ng Passi), is a component city in the province of Iloilo, Philippines. According to the 2024 census, it has a population of 90,313 people.

Passi is the only component city in the province of Iloilo, and ranks as the largest in terms of land area and income, and second only to Oton in population size.

Passi was a settlement founded by the three Malayan brothers named Dig- on, Tokiab and Umawang at the beginning of its history. This settlement (purok) was well protected from possible attack from adjacent purok.

Passi was discovered and established as a mission parish by Spanish explorers in 1584 under the patronage of St. William of Maleval. In 1593, Padre Juan Villamayor, an Augustinian friar, became its first resident priest. Initially, the mission church was constructed using lightweight materials near the Jalaur River's riverbank. However, in 1600, it was relocated to its current site and rebuilt using stones, slabs, and lime for its foundation and walls. Parishioners contributed by transporting necessary materials to the construction site during their visits to the church. Construction was completed during Padre Pedro Ceberio's tenure, with Salvador “Badong” Panes Perfecto serving as the town's Captain at the time.

Passi holds historical significance as one of the oldest Spanish settlements in Iloilo. Established as a pueblo (community settlement of natives) in 1766, it appointed Don Martin Saligumba as its inaugural gobernadorcillo.

In 1957, the sitio of Agtabo within Passi was officially recognized as a barrio, formerly part of the barrio (district) of Salngan. In the same year, the barrio of Santa Rosa was officially renamed Santo Tomas.

Passi experienced significant development during this period, becoming a center for trade and commerce due to its strategic location. This growth attracted more investment to the municipality, resulting in increased income, population, and territorial expansion. As a result, Passi was recognized as the first component city in the island of Panay. On January 30, 1998, President Fidel V. Ramos signed R.A. 8469, officially converting Passi into a city.

According to popular legend, Spanish conquistadors stumbled on a small hut by the river's bank where an old woman was found winnowing pounded rice. One of them asked her, “¿Cómo se llama este lugar?” not speaking the native language. Misinterpreting the question, the woman responded with "Ah, pasi," which in her language meant "rice", assuming they were asking about the contents of her basket. An alternative interpretation is that "pasi" was a local Malay dialect from the word 'putih' which means "white" - possibly referring to the encounter with the Spaniards themselves. Following this encounter, the Spanish settlers adopted the name Pasi for the location, which eventually transformed into the present-day name of Passi.