Germanium iodides are inorganic compound with the formula GeI<sub>x</sub>. Two such compounds exist: germanium(II) iodide, , and germanium(IV) iodide .
Germanium(II) iodide is an orange-yellow crystalline solid which decomposes on melting. Its specific density is 5.37 and it can be sublimed at 240 ðC in a vacuum. It can be prepared by reducing germanium(IV) iodide with aqueous hypophosphorous acid in the presence of hydroiodic acid. It is oxidised by a solution of potassium iodide in hydrochloric acid to germanium(IV) iodide. It reacts with acetylene at 140àðC to form an analogue of cyclohexa-1,4-diene in which the methylene groups, , are replaced with diiodogermylene groups, .
Germanium(IV) iodide is an orange-red crystalline solid with melting point 144 ðC and boiling point 440 ðC (with decomposition). Its specific density is 4.32. It is soluble in non-polar solvents like carbon disulfide, chloroform or benzene, but hydrolyses readily.
Mixed anion compound germanide iodides are also known.