A new complex of formamidinium trisulphide with bromine has been synthesized. Single-crystal X-ray analysis of this compound revealed a novel trisulphide linkage in the formamidinium trisulphide moiety. The crystals belong to orthorhombic space group Fdd2 with a = 14.9119(15), b = 16.5241(17), c = 8.5114(9) A, V = 2097.3(4) angstrom(3), R-1 = 0. 0326, and wR(2) = 0.0846 for 2666 reflections. All four amine groups are hydrogen linked to four different formamidinium trisulphide molecules through bromine atoms, making a beautiful three-dimensional network of hydrogen bonds, which stabilize the crystal structure.