| Acronym | Definition |
|---|
| OLD | Old Version (file name extension) |
| OLD | Online Dating |
| OLD | Obstructive Lung Disease (respiratory disease) |
| OLD | Office of Legislative Drafting (Australia) |
| OLD | Occupational Lung Disease |
| OLD | Obsessive Love Disorder (mental health) |
| OLD | Oxford Latin Dictionary |
| OLD | Original Drawing |
| OLD | Optical Line Distribution |
| OLD | One-Line Diagram |
| OLD | Output Linefeed Disposition |
| OLD | Office of Logic Design (NASA) |
| OLD | Orchid List Digest |
| OLD | Optical Line Driver |
| OLD | Operating Level Days |
| OLD | Off-Load Device |
| OLD | Operations Limitation Document |
| OLD | Operational Logic Diagram |
| OLD | On-Line Tests and Diagnostics (US DoD) |