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)