Zn[Pb(IO3)6].6H20 crystallizes in the space group P] with a= 6"905 (7), b= 7"285 (6), c= 10.976 (9) /~, ~=97.2 (1) °, p= 104.15 (8) °, y=88.11 (8) °, Z=I. The intensities were collected on a four-circle diffractometer and corrected for absorption. The crystal structure was determined by the heavy-atom method. Refinement by the least-squares method with anisotropic temperature factors for the heavy atoms (Pb, I,Zn) and isotropic temperature factors for the O atoms converged at R= 4.9 %. The Pb atoms are surrounded by six O atoms belonging to the six -O-102 groups. The O atoms form a distorted octahedron; in particular the distance Pb-O(4) is very short (2-070 A). The I atoms are also surrounded by six O atoms but the octahedron is very distorted. For each I atom there are three I-O distances between 1.766 and 1"898 ,& and three more between 2.546 and 3"083 ~. An interesting feature of the structure is the coordination of the Zn atoms. There is no [Zn(H20)6] 2+ octahedron but instead an octahedron formed by four water molecules and two O atoms of the iodate groups. The other water molecules are embedded in the structure as real structure water. All parts of the structure are linked together by hydrogen bonds.