| HDDC | Historic District Development Corporation | |
| HDDC | Historic Deutschtown Development Corporation | |
| HDDC | Historic Deutschtown Development Corporation | |
| HDDC | Harvard Digestive Disease Center | |
| HDDC | High Desert Design Council | |
| HDDCS | Hum Dil De Chuke Sanam | |
| HDDCS | Higher Dimensional Digital Chaotic Systems | |
| HDDD | High Desert Discovery District | |
| HDDD | Headache Due to Drunkenness Disorder | |
| HDDD | Hereditary Dysphasic Disinhibition Dementia | |
| HDDD | Heavy Duty Diesel Diagnostics | |
| HDDD | Honorably Discharged Dishonorably Deported | |
| HDDD | Hot Diggity Dog Day | |
| HDDD | Health Diagnostics and Drug Development | |
| HDDD | Health Diagnostics and Drug Development | |
| HDDD | Health Diagnostics and Drug Development | |
| HDDE | Heavy Duty Diesel Engine | |
| HDDEC | Heavy Duty Diesel Emissions Control | |
| HDDEDS | Heavy Duty Diesel Engine Dynamometer Schedule | |
| HDDEO | Heavy Duty Diesel Engine Oil | |
| HDDI | Host Document Data Interchange | |
| HDDI | Heavy Duty Direct Injection | |
| HDDI | Hialeah Dade Development Inc | |
| HDDI | Hialeah Dade Development Inc | |
| HDDI | Hot Diluted Diffusion Ignition |
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