Diselenide may refer to:
Diselane, H-Se-Se-H Carbon diselenide, CSe2, a yellow-orange oily liquid with pungent odor Any organic chemical compound with a selenium-selenium bond, R-Se-Se-R (see Organoselenium chemistry) Diphenyl diselenide, (C6H5)–Se–Se–(C6H5) selenocystine Metal dichalcogenides Manganese diselenide (MnSe2) Molybdenum diselenide (MoSe2) Tungsten diselenide (WSe2) Titanium diselenide (TiSe2)