| Acronym | Definition |
|---|
| TSU | Texas Southern University |
| TSU | Tennessee State University |
| TSU | Taiwan Solidarity Union |
| TSU | Tarleton State University (Texas) |
| TSU | Texas State University (San Marcos, Texas) |
| TSU | Technical Support Unit |
| TSU | This Side Up |
| TSU | Time Sharing User |
| TSU | Truman State University |
| TSU | Troy State University |
| TSU | Tbilisi State University (Tbilisi, Georgia) |
| TSU | Tri-State University (Angola Indiana) |
| TSU | Traffic Safety Unit (various locations) |
| TSU | Towson State University (Maryland) |
| TSU | Technical Services Unit |
| TSU | Technology and Software Unrestricted (Export Control) |
| TSU | Tactical Small Unit (US DoD) |
| TSU | The Sniper Upstarts (gaming clan) |
| TSU | Technical Services Unlimited |
| TSU | Telescopic Sight Unit |
| TSU | Thermal Storage Unit |
| TSU | Tyumen State University (Tyumen, West-Sibiria) |
| TSU | Time Stamp Unit |
| TSU | Tulsa-Sapulpa Union Railway Company |
| TSU | Tobacco Survivors United |
| TSU | Temperature Sensing Unit |
| TSU | Thyristor Supply Unit |
| TSU | Thermal Structural Unit |
| TSU | Technical Security Upgrades |
| TSU | Technical Service Update |
| TSU | Tsentral'noye Statisticheskoye Upravleniye (Central Statistical Administration) |
| TSU | Trade Statistics Unit of HMRC (Her Majesty's Revenue & Customs; UK) |
| TSU | Tri State Unlimited |
| TSU | Tax Set-Up |
| TSU | Traffic Simulation Unit |