The Riesz theorem may refer to any of several mathematical theorems due to brothers Frigyes Riesz and Marcel Riesz:
- F. and M. Riesz theorem
 - F. Riesz's theorem – Characterizes finite-dimensional Hausdorff topological vector spaces (TVSs).
 - Riesz representation theorem
 - M. Riesz extension theorem
 - Riesz–Thorin theorem
 - Riesz–Fischer theorem
 - Riesz's lemma
 - Riesz–Markov–Kakutani representation theorem
 
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