| Official Name: | Dassa I |
| Pushpin Map Caption: | Location in Benin |
| Subdivision Type: | Country |
| Subdivision Name: |  Benin |
| Subdivision Type1: | Department |
| Subdivision Name1: | Collines Department |
| Subdivision Type2: | Commune |
| Subdivision Name2: | Dassa-Zoumé |
| Unit Pref: | Imperial |
| Population As Of: | 2002 |
| Population Total: | 8401 |
| Timezone: | WAT |
| Utc Offset: | +1 |
Dassa I is an arrondissement in the Collines department of Benin. It is an administrative division under the jurisdiction of the commune of Igbo Idaasha. According to the population census conducted by the Institut National de la Statistique Benin on February 15, 2002, the arrondissement had a total population of 8,401.[1]