| Official Name: | XX Settembre |
| Settlement Type: | Urban zone of Rome |
| Mapsize: | 200px |
| Pushpin Label Position: | bottom |
| Subdivision Type: | Country |
| Subdivision Name: | Italy |
| Subdivision Type1: | Region |
| Subdivision Name1: | Lazio |
| Subdivision Type2: | Metropolitan City |
| Subdivision Name2: | Rome |
| Subdivision Type3: | Comune |
| Subdivision Name3: | Rome |
| Subdivision Type4: | Municipio |
| Subdivision Name4: | Municipio I |
| Established Title: | Established |
| Established Date: | 30 July 1977 |
| Unit Pref: | Imperial |
| Area Total Km2: | 1.4 |
| Population As Of: | 2010 |
| Population Footnotes: | [1] |
| Population Total: | 10670 |
| Timezone: | CET |
| Utc Offset: | +1 |
| Timezone Dst: | CEST |
| Utc Offset Dst: | +2 |
XX Settembre is an urban zone of Rome, Italy, identified by the initials 1F.
It takes its name from the main road, Via Venti Settembre, established on 30 November 1871[2] and dedicated to the day in 1870 when Italian troops, led by General Raffaele Cadorna, entered Rome through a breach in the Aurelian Walls near Porta Pia.