| Abbreviation | Definition |
|---|---|
| MTHD | Minimization of Total Harmonic Distortion |
| MTHFR | Methylene Tetra Hydro Folate Reductase |
| MTHFR | Metylene Tetra Hydro Folate Reductase |
| MTHL | Mercury Thermal Hydraulic Loop |
| MTHL | Mumbai Trans Harbor Link |
| MTHL | Mumbai Trans Harbour Link |
| MTHR | Mobile Telecommunications and Health Research |
| MTHR | Mobile Telecommunications Health Research |
| MTHS | Merlin Trinity Healing System |
| MTHS | Middle Tennessee Hosta Society |
| MTHS | Middletown Township Historical Society |
| MTHS | Mountain Top Historical Society |
| MTHS | My Time Has Significance |
| MTHSS | Murtis Taylor Human Services System |
| MTI | Machwuerth Team International |
| MTI | Madison Teachers Inc |
| MTI | Magyar Távirati Iroda |
| MTI | Mandatory To Implement |
| MTI | Marine Technologies International |
| MTI | Market Timing Indicator |