| Abbreviation | Definition |
|---|---|
| GRZ | General Residential Zone |
| HB | Heterorhabditis Bacteriophora |
| HCHR | Healthy Cities Healthy Residents |
| HIRF | High Intensity Residential Fires |
| HIRS | Himalayan International Residential School |
| HPCN | Home Performance Contractor Network |
| HRO | Hillside Residential Open |
| HRS | Holland Residential Services |
| IRC | International Residential College |
| IRCF | Informal Residential Care Facilities |
| IREE | Improving Residential Energy Efficiency |
| IRSHDC | Indian Residential School History & Dialogue Centre |
| IRSS | Individual Residential Services and Supports |
| IRSS | Individual Residential Services Supports |
| IRSS | Individual Residential Support Services |
| IRSS | Instant Resident Selection System |
| IRTC | Intensive Residential Treatment Center |
| IRTP | Intensive Residential Treatment Programs |
| IRTS | Intensive Residential Treatment Services |
| ISRP | Individually Sponsored Residential Project |