Novel polynuclear rare earth compounds [La3(OH2)7(Cp*MoO3)2(NO3)7] and [La3(OH2)5(THF)(Cp*MoO3)2(NO3)6]2(NO3)2 were synthesized by reacting [(n-C4H9)4N][Cp*MoO3] with La(NO3)3·6H2O in THF. X-ray crystal structural analyses revealed that both these compounds are composed of a La3Mo2O6 unit in which the metal atoms arrange themselves into a trigonal bipyramid. The Ce analogues were also obtained.