| Acronym | Definition |
|---|
| PIER | Public Interest Energy Research |
| PIER | Penn Institute for Economic Research |
| PIER | Peer to Peer Information Exchange and Retrieval |
| PIER | Progress in Electromagnetics Research |
| PIER | Physicians' Information and Education Resource (American College of Physicians) |
| PIER | Public Information, Education and Relations |
| PIER | Pacific Islands Ecosystems At Risk |
| PIER | Programs in International Educational Resources (Yale University) |
| PIER | Procedures for Internet/Enterprise Renumbering |
| PIER | Paediatric Information and Education Resource (UK) |
| PIER | Pfleger Institute of Environmental Research (California, USA) |
| PIER | Professional International Education Resources (Spring Hill, QLD, Australia) |