• Taiwan Solidarity Union
• Tarleton State University
• Tartu State University
• Tbilisi State University
• Texas Southern University
• Texas State University
• Teachers Support Unit
• Tennessee State University
• The Sunshine Underground, an indie rock band from Leeds, England
• Time Sharing User in mainframes
• Tomsk State University
• Trade Services Utility, a banking initiative for improving the Financial Supply Chain
• Tri-State University
• Tulsa-Sapulpa Union Railway

Search Engine Augmentation (recently published contemporary usages):

• References to the great Naval Battle of Tsushima, aka. Battle of Tsu-Shima, Battle of Tsu Shima
• Tsu Shima Strait ---- see Tsushima Strait
• Tsu-Shima Strait ---- see Tsushima Strait
• Tsushima Islands aka Tsu Shima and Tsu-Shima

Tsu can mean:

• One of the syllables of the Japanese kana syllabaries.
• the Japanese city of Tsu in Mie Prefecture.
• Tsū (with a long u) is a Japanese aesthetic ideal related to iki.