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- Jackson's theorem (queueing theory)
- Jacobi's four-square theorem (number theory)
- Jacobson density theorem (ring theory)
- Jacobson–Morozov theorem (Lie algebra)
- Japanese theorem for concyclic polygons (Euclidean geometry)
- Japanese theorem for concyclic quadrilaterals (Euclidean geometry)
- John’s theorem (geometry)
- Jordan curve theorem (topology)
- Jordan–Hölder theorem (group theory)
- Jordan–Schönflies theorem (geometric topology)
- Jordan–Schur theorem (group theory)
- Jordan's theorem (multiply transitive groups) (group theory)
- Jung's theorem (geometry)
- Jurkat–Richert theorem (analytic number theory)
Read more about this topic: List Of Theorems