| Official Name: | București – Ilfov |
| Settlement Type: | Region |
| Subdivision Type4: | Largest city |
| Subdivision Name4: | Bucharest |
| Area Total Km2: | 1811 |
| Area Rank: | 8th |
| Population As Of: | 2021 census |
| Population Rank: | 6th |
| Population Total: | 2259665 |
| Population Footnotes: | [1] |
| Population Density Km2: | auto |
| Demographics Type2: | GDP |
| Demographics2 Footnotes: | [2] |
| Demographics2 Title1: | Total |
| Demographics2 Info1: | €80.394 billion (2022) |
| Utc Offset: | +2 |
| Utc Offset Dst: | +3 |
| Blank Name Sec1: | NUTS code |
| Blank Info Sec1: | RO32 |
| Blank1 Name Sec2: | HDI (2022) |
| Website: | http://www.adrbi.ro/ |
The București – Ilfov development region is a development region in Romania, encompassing the national capital, Bucharest, as well as the surrounding Ilfov County. As other development regions, it does not have any administrative powers, its main function being to co-ordinate regional development projects and manage funds from the European Union. It is also used as an entity in regional statistical analysis at the European Union NUTS-II level.