APTI
| Acronym | Definition |
|---|---|
| APTI | Air Pollution Training Institute |
| APTI | ARCO (Atlantic Richfield Oil Company) Power Technologies, Inc. |
| APTI | Association for Preservation Technology International |
| APTI | Association for Psychological Type International |
| APTI | American Post Tension, Inc. (formerly Magic Communications, Inc.; pay phones) |
| APTI | Advanced Power Technology, Inc. (Setauket, NY) |
| APTI | Association of Pharmaceutical Teachers of India (est. 1966; Bangalore, India) |