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The title compound, tetrasodium cobalt(II) tris[molybdate(IV)], was prepared by solid-state reactions. The structure is isotypic with Na 3 In 2 (AsO 4 ) 3 and Na 3 In 2 (PO 4 ) 3 . The main structural feature is the presence of infinite chains of edgesharing X 2 O 10 (X = Co/Na) dimers, which are linked by MoO 4 tetrahedra, forming a three-dimensional framework enclosing two types of hexagonal tunnels in which Na + cations reside. In this alluaudite structure, Co and Na atoms are located at the same general site with occupancies of 0.503 (5) and 0.497 (6), respectively. The other three Na and one of the two Mo atoms lie on special positions (site symmetries 2, 1, 2 and 2, respectively). The structure is compared with similar structures and other members of alluaudite family.Keywords: crystal structure; X-ray diffraction; molybdate; alluaudite.