In　the　title　complex,　[Cd(C6H4NO3)(2)(H2O)(4)],　the　Cd-II　atom　is　situated　on　a　crystallographic　centre　of　inversion.　The　Cd-II　atom　shows　a　slightly　distorted　octahedral　geometry　and　is　coordinated　by　four　O　atoms　from　water　molecules　and　two　O　atoms　from　deprotonated　carboxyl　groups　of　nicotinic　acid　N-oxide　ligands.　The　mononuclear　complex　molecules　are　linked　by　O-H　center　dot　center　dot　center　dot　O　hydrogen　bonds,　forming　a　three-dimensional　network　structure.