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Bis-[oxo-bis(p-ferrocenylbenzoxy di-n-propyltin)] I and bis-[oxo-bis(β-ferrocenoyl- propionyloxy di-n-propyltin)] II were synthesized and their crystal structures have been determined by X-ray diffraction analysis. The compound I@2C6H6 ([(FcC6H4COOSnPr2)2O]2@2C6H6 or C92H108Fe4O10Sn4@2C6H6, Mr = 2384.16) is of triclinic, space group Pī with a = 12.826(4), b = 13.099(5), c = 17.539(5)(A°),α= 78.229(5),β= 71.852(5),γ= 62.746(5)°, V = 2483(1)(A°)3, Z = 1, Dc = 1.490 g/cm3, λ = 0.71073(A°),μ(MoKα) =1.611 mm-1 and F(000) = 1128. The structure was refined to R = 0.0491 and wR = 0.1053 for 4690 unique reflections with I > 2σ(I). The compound II@C6H6 ([(FcCOCH2CH2COOSnPr2)2O]2@C6H6 or C80H108Fe4O14Sn4@C6H6, Mr = 2115.93) is of triclinic, space group Pī with a = 11.260(4), b = 14.126(5), c = 15.961(6)(A°), α = 91.400(6), β = 110.654(6), γ = 104.931(6)°, V = 2277(1)(A°)3, Z = 1, Dc = 1.510 g/cm3, λ = 0.71073(A°), μ(MoKα) = 1.750 mm-1 and F(000) = 1046. The structure was refined to R = 0.0466 and wR = 0.1138 for 5061 unique reflections with I > 2σ(I). The two compounds have the similar structures: both are dimers containing centrosymmetric Sn2O2 cores. But there are some differences in the ligating modes between the carboxylate groups and the Sn atoms.