| Dĩ An | |
| Official Name: | Di An City |
| Native Name: | Thành phố Dĩ An |
| Settlement Type: | Provincial city (Class-2) |
| Pushpin Map: | Vietnam |
| Pushpin Map Caption: | Location of in Vietnam |
| Pushpin Mapsize: | 300 |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | Bình Dương |
| Leader Title: | Chairman of the People's Committee |
| Leader Name: | Lê Thành Tài |
| Leader Title1: | Chairman of the People's Council |
| Leader Name1: | Ngô Ngọc Điệp |
| Established Title: | Founded |
| Established Date: |
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| Area Total Km2: | 60.05 |
| Population As Of: | 2021 |
| Population Total: | 463.023 |
| Population Density Km2: | 7,711 |
| Timezone: | Indochina Time |
| Utc Offset: | +7 |
| Coordinates: | 10.9039°N 106.7678°W |
Dĩ An is a city of Bình Dương Province in the Southeast region of Vietnam, about 20 km north of central Ho Chi Minh City (formerly Saigon). It is 1,706 km by rail from Hanoi. At the 2009 census the city had a population of 73,859.[1] The town covers 60 km².
Dĩ An consists of seven wards: Dĩ An, An Bình, Bình An, Bình Thắng, Đông Hòa, Tân Bình and Tân Đông Hiệp.
The city is the proposed junction for the Trans-Asian Railway that would connect half a dozen railways in southeast Asia, starting with Cambodia. This line would cross the Cambodian border near Lộc Ninh.
Dĩ An is an important destination of the national railway with two railway stations: Dĩ An and Sóng Thần. The area's tram factory is the largest in South Vietnam. Dĩ An was also the headquarters for the American 1st Infantry Division (nicknamed "The Big Red One") during the Vietnam War. Later in 1969 and 1970 the 1st Infantry Division was withdrawn to the US, and The 11th Armored Cavalry Regiment was there until 1972. It also houses the largest bus station in Vietnam, New Eastern Bus Station.