| Eugênio de Castro | |
| Settlement Type: | Municipality |
| Pushpin Map: | Brazil |
| Pushpin Map Caption: | Location in Brazil |
| Coordinates: | -28.3583°N -54.1489°W |
| Subdivision Type: | Country |
| Subdivision Name: |  Brazil |
| Subdivision Type1: | State |
| Subdivision Name1: | Rio Grande do Sul |
| Subdivision Type2: | Meso-region |
| Subdivision Name2: | Noroeste Rio-Grandense --> |
| Subdivision Type3: | Micro-region |
| Subdivision Name3: | Santo Ângelo |
| Leader Title: | Prefect |
| Area Total Km2: | 419.32 |
| Population Total: | 2,352 |
| Population As Of: | 2020 [1] |
| Population Density Km2: | auto |
| Timezone1: | BRT |
| Utc Offset1: | -3 |
| Postal Code Type: | Postal code |
| Area Code Type: | Phone code |
Eugênio de Castro is a municipality of the northern part of the state of Rio Grande do Sul, Brazil. The population is 2,352 (2020 est.) in an area of 419.32 km².[2] It is located 435 km west of the state capital of Porto Alegre, northeast of Alegrete.