The complex {[Eu2F3⋅4H2O]⋅3H2O} n (H2F = fumaric acid) has been synthesized and structurally characterized by single crystal X-ray diffration methods. The complex crystallizes in the monoclinic system with space group P21/n, lattice parameters a = 9.475(3) Å, b = 14.700(5) Å, c = 14.810(4) Å, α = 90∘, β = 91.250(5)∘, γ = 90∘, V = 2062.1(11) Å3, Z = 4, D calc = 2.487 Mg/m3. The Eu(III) center is in distorted tricapped trigonal prism coordination environment that is coordinated by nine oxygen atoms, seven from five F2− groups, two from two water molecules. Eu(III) ions are connected into three-dimensional coordination network structure by the oxygen atoms of the carboxyl groups and hydrogen bonds.