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- quadrifolium
- Quadriga of St. Mark's Basilica
- quadrilateral
- quadrilateral of chords
- quadrilateral tiling
- quadrilateral web
- quadrilinear form
- quadrille
- quadrillion
- quadrinomial
- quadrinomial equation
- quadripartite curve
- quadripartition
- quadriplanar coordinate
- quadriplegia rehabilitation
- quadripolar surface
- quadriquaternion
- quadrivalent
- quadrivium
- quadrode
- quadrulus
- quadruple
- Quadruple Alliance
- quadruple-entry bookkeeping
- quadruple lattice