| Acronym | Definition | 
|---|
| MTSB➣Modified Trypticase Soy Broth (pathology) | 
| MTSB➣Michael Tschechow Studio Berlin (Germany) | 
| MTSB➣Massillon Tiger Swing Band (high school marching band; Massillon, OH) | 
| MTSB➣Masscorp Trading Sdn. Bhd. (Kuala Lumpur, Malaysia) | 
| MTSB➣Metropolitan Toronto School Board (Canada) |