| Agualva-Cacém | |
| Native Name Lang: | PT |
| Settlement Type: | City |
| Flag Border: | no |
| Pushpin Map: | Portugal |
| Pushpin Map Caption: | Location of Agualva-Cacém |
| Coordinates: | 38.7678°N -9.2994°W |
| Subdivision Type: | Country |
| Subdivision Name: |  Portugal |
| Subdivision Type1: | Region |
| Subdivision Name1: | Lisbon |
| Subdivision Type2: | Subregion |
| Subdivision Name2: | Greater Lisbon |
| Subdivision Type3: | District |
| Subdivision Name3: | Lisbon |
| Subdivision Type4: | Municipality |
| Subdivision Name4: | Sintra |
| Seat Type: | Municipality |
| Seat: | Sintra |
| Government Footnotes: | The administration and legal authority is invested in the Câmara Municipal of the Municipality of Sintra |
| Leader Title: | Presidente |
| Unit Pref: | Metric |
| Area Total Km2: | 127 |
| Elevation M: | 43 |
| Population Total: | 81845 |
| Population As Of: | 2001 |
| Population Density Km2: | auto |
| Population Demonyms: | Cacémense (from Cacém), Agualvense (from Agualva) |
| Population Note: | Refers to the urbanized portions of the parishes of Agualva, Cacém, Mira-Sintra and São Marcos only |
| Timezone1: | WET |
| Utc Offset1: | 0 |
| Timezone1 Dst: | WEST |
| Utc Offset1 Dst: | +1 |
| Postal Code: | 2735-000:2735-999 |
| Area Code Type: | Postal Zone |
| Area Code: | (+351) 21X XXX XXX |
| Iso Code: | PT |
Agualva-Cacém (pronounced as /pt/) is a Portuguese city located in the municipality of Sintra. It comprises the civil parishes of Agualva, Cacém, Mira-Sintra, and São Marcos, equivalent to 81,845 inhabitants of the municipalities population.
The name Agualva-Cacém belonged to a civil parish that encompassed 10.511NaN1 of the municipality of Sintra. On 12 July 2001, that parish was elevated to the status of city and divided into four civil parishes (24 July 2001).
The toponym "Agualva" is derived from the Latin Aqua alba, meaning white (pure) water, while "Cacém" is derived from the Arabic Qāsim (قاسم), meaning "the one who distributes".
Agualva-Cacém is divided into four civil parishes, which fall within a territorial extent within the Greater Lisbon subregion, an area of mostly residential suburbs.
With the Reorganização Administrativa do Território das Freguesias (Administrative Reorganization of the Territory of Parishes) - Law Nº. 11-A/2013, 21st of January, 2013, the four parishes were merged in two unions of parishes: União das Freguesias de Agualva e Mira-Sintra and União das Freguesias do Cacém e S. Marcos.
The train station (Agualva-Cacém railway station) has existed since 1887 (then under the operation of the Larmanjat railway company (1870-1877)). Remodeling works began in 2008, with the new station building opening in 2013.
There are several football clubs in Agualva-Cacém and two futsal clubs; these include: