Tantalum(V) iodide is the inorganic compound with the formula Ta2I10.

[2] It is a diamagnetic, black solid that hydrolyses readily.

The compound adopts an edge-shared bioctahedral structure, which means that two TaI5 units are joined by a pair of iodide bridges.

[3] Niobium(V) chloride, niobium(V) bromide, niobium(V) iodide, tantalum(V) chloride, and tantalum(V) bromide all share this structural motif.

Tantalum pentaiodide forms from the reaction of tantalum pentoxide with aluminium triiodide:[4]