| Guidan Roumdji | |
| Settlement Type: | Department |
| Mapsize: | 300px |
| Subdivision Type: | Country |
| Subdivision Name: | Niger |
| Subdivision Type1: | Region |
| Subdivision Name1: | Maradi Region |
| Unit Pref: | Imperial |
| Area Total Km2: | 4,664 |
| Population As Of: | 2012 census |
| Population Total: | 523,717 |
| Population Density Km2: | auto |
| Timezone: | GMT 1 |
| Utc Offset: | +1 |
Groumdji is a department of the Maradi Region of Niger. Its capital lies at the city of Guidan Roumdji. As of 2012, the department had a total population of 523,717 people.[1] [2]