| Abbreviation | Definition |
|---|---|
| HSWU | Health Services Workers Union |
| HSWU | Hye Sung Workers Union |
| HTCU | Hamilton Teachers Credit Union |
| HTU | Halifax Typographical Union |
| HUAC | Hollywood Union of Actors and Cinematographers |
| HUB | Hadley Union Building |
| HUB | Halsey Union Building |
| HUB | Hetzel Union Building |
| HUB | Huntingdon Union Building |
| HUB | Husky Union |
| HUC | Hebrew Union College |
| HUCA | Hebrew Union College Annual |
| HUCP | Hebrew Union College Press |
| HUECU | Harvard University Employee Credit Union |
| HUFO | HCMC Union of Friendship Organizations |
| HULU | Hundred Usual Licensed Union |
| HUTB | Hose Union Tap Boxes |
| HVCU | Happy Valley Credit Union |
| HWU | Health Workers Union |
| IABSOIWA | International Association of Bridge, Structural, and Ornamental Iron Workers of America |