Reaction of [GeCl₂(dioxane)] with [18]aneS₆ (1,4,7,10,13,16-hexathiacyclooctadecane) gives the neutral [GeCl₂([18]aneS₆)] which forms a supramolecular sheet network involving exocyclic coordination, with the macrocycles bridging Ge atoms which are in a pseudo-trigonal bipyramidal environment from two Cl and two S atoms (saw-horse), with one lone pair assumed to occupy the remaining equatorial void. Conversely, using the mixed S/O macrocycles [18]aneS₃O₃ (1,4,7-trithia-10,13,16-trioxacyclooctadecane) and [15]aneS₂O₃ (1,4-dithia-7,10,13-trioxacyclopentadecane) (L) leads to the monocationic pentagonal pyramidal [GeCl(L)]⁺ whose structures show endocyclicGe coordination, and displacement of one Cl. The Ge–S and Ge–O bond lengths are surprisingly disparate in these two complexes, and in the former the coordinated Cl is axial, while in the latter it occupies the pentagonal plane (with an S atom axial). Cyclic selenoethers form one-dimensional or two-dimensional supramolecular assemblies with Ge(II) halides, including [GeCl₂([8]aneSe₂)] ([8]aneSe₂ = 1,5-diselenacyclooctane), [(GeCl₂)₂([16]aneSe₄)] ([16]aneSe₄ = 1,5,9,13-tetraselenacyclohexadecane), [GeBr₂([16]aneSe₄)] and [(GeI₂)₂([16]aneSe₄)]·GeI₄ – these represent the first germanium species with selenoether ligation. Structural studies on each of these show exocyclicGeX₂ coordination, giving networks based upon Se₂X₂ coordination at Ge(II) with a distorted pseudo-trigonal bipyramidal environment in which the Ge-based lone pair is assumed to occupy the vacant equatorial vertex. Further weak Ge⋯X contacts are also evident in some cases. The weak, secondary Ge⋯S/Se and Ge⋯X interactions that pervade these systems may be regarded as a further type of supramolecular interaction allowing assembly of new network structures, and the long I⋯I contacts evident between the GeI₂ and GeI₄ units in [(GeI₂)₂([16]aneSe₄)]·GeI₄ probably provide a small thermodynamic contribution leading to co-crystallisation of ordered GeI₄ molecules within the network.