| Acronym | Meaning |
| ETR | Eastern Test Range |
| ETR | Ecological Tax Reform |
| ETR | Electronic Target Range (UK) |
| ETR | Electronic Tax Register |
| ETR | Electronically Transmitted Return (US IRS) |
| ETR | Electronics Technician Radar (US Navy) |
| ETR | Embedded Training Requirements |
| ETR | End of Tour Report |
| ETR | Engine Transaction Report |
| ETR | Engineering Technical Review |
| ETR | Engineering Test Requirements |
| ETR | Estimated Time of Restoration |
| ETR | Estimated Time Remaining |
| ETR | Experimental Test Reactor |
| ETR | Experimental Type Rating (US FAA) |
| ETR | Export Traffic Release |
| ETR | Extended Target Region |