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A critical review of the use of soluble transition-metal nanoclusters for the hydrogenation of monocyclic aromatic compounds is presented. The review begins with a brief introduction to arene hydrogenation and to nanocluster science. The introductory material is followed by a detailed discussion of the approximately 20 papers in the literature that deal with the use of soluble transition-metal nanoclusters for the hydrogenation of monocyclic aromatic compounds. Metal particle catalysts on solid supports are not reviewed herein, and are considered only as far as they serve to compare and contrast with soluble transition-metal nanoclusters. The major findings of this review are: (i) soluble nanocluster catalysts are implicated as the true catalysts in many putatively “homogeneous” arene hydrogenations; (ii) with few exceptions, nanocluster catalysts used for arene hydrogenation are poorly characterized; (iii) soluble …