Square Gyrobicupola
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Johnson Solid 
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- Transposition Order
- Transversal Array
- Transversal Design
- Transversal Line
- Transylvania Lottery
- Trapdoor Function
- Trapezium
- Trapezohedron
- Trapezoid
- Trapezoidal Hexecontahedron
- Trapezoidal Icositetrahedron
- Trapezoidal Rule
- Traveling Salesman Constants
- Traveling Salesman Problem
- Trawler Problem
- Trebly Magic Square
- Tredecillion
- Tree
- Tree-Planting Problem
- Tree Searching
- Trefoil Curve
- Trefoil Knot
- Trench Diggers' Constant
- Triabolo
- Triacontagon