The comparative study of crystal structures of heterocyclic organotellurium diiodides viz. 1,1,2,3,4,5-hexahydro-1,1-diiodotellurophene (C 4 H 8 TeI 2 ) (1); 1,1,2,3,4,5,6-heptahydro-1,1-diiodotellurane (C 5 H 1 0 TeI 2 ) (2), and 1,3-dihydro-2λ 4 -benzotellurole-2,2-diyl diiodide (C 8 H 8 TeI 2 ) (3), with respect to polymorphism, bond lengths, bond angles; (a) Te I; (b) Te C; (c) I Te I; (d) C Te C; (e) C Te I, and intermolecular secondary bonds; (f) Te...I; (g) I Te...I; and (h) C Te...I, are described. The structures of all heterocyclic organotellurium diiodides were established by single crystal X-ray diffraction studies. In each case a distorted octahedral (six-coordinate) geometry exists around tellurium atom with Te...I secondary bonds leading to 2-dimensional zigzag ribbons in 1, trimeric molecular aggregates in 2 while 3 is a 3-dimensional polymer.