| Acronym | Sense | Language | Topics |
|---|---|---|---|
| ApAc | Applied Acoustics | In English | → Serial publications, periodicals → Acoustics → Acoustical engineering |
| APAC | Attaché Principal d'Administration Centrale | In French | → Central administration |
| APAC | Association Pour l'Assurance Confédérale | In French | → Associations → Insurance |
| APAC | Associação Portuguesa dos Amigos dos Caminhos de Ferro (http://apac.cp.pt) | In Portuguese | → Associations → Rail transport engineering |