| OECA | Optoelectronic Components and Applications (Dahlwitz-Hoppegarten, Germany) | 光电元件和应用（德国达尔维茨-霍普佩加滕） |
| OECA | Ontario Educational Communications Authority | 安大略省教育传播局 |
| OECA | Organizaciones EconÓmicas Campesinas (Campesino Economic Organizations) | Organizaciones EconÓmicas Campesinas (Campesino Economic Organizations) |
| OECA | Ontario Educational Communications Authority (Canada) | 安大略省教育传播管理局（加拿大） |
| OECA | Office of Enforcement and Compliance Assurance | 执行和合规保证办公室 |