Trichloride may refer to:
- The trichloride ion, a polyhalogen ion
- Actinium trichloride, AcCl<sub>3</sub>
- Aluminium trichloride, AlCl<sub>3</sub>
- Americium trichloride, AmCl<sub>3</sub>
- Antimony trichloride, SbCl<sub>3</sub> also known as butter of antimony
- Arsenic trichloride, AsCl<sub>3</sub>, also known as arsenous chloride or butter of arsenic
- Berkelium trichloride, BkCl<sub>3</sub>
- Bismuth trichloride, BiCl<sub>3</sub>
- Boron trichloride, BCl<sub>3</sub>, a colorless gas and valuable reagent in organic synthesis
- Butyltin trichloride, an organotin compound
- Californium trichloride, LaCl<sub>3</sub>
- Cerium trichloride, CeCl<sub>3</sub>
- Cobalt trichloride, CoCl<sub>3</sub>
- Chromium trichloride, CrCl<sub>3</sub>
- Curium trichloride, CmCl<sub>3</sub>
- Dysprosium trichloride, DyCl<sub>3</sub>
- Einsteinium trichloride, EsCl<sub>3</sub>
- Europium trichloride, EuCl<sub>3</sub>
- Erbium trichloride, ErCl<sub>3</sub>
- Gadolinium trichloride, GdCl<sub>3</sub>
- Gallium trichloride, GaCl<sub>3</sub>
- Gold trichloride, AuCl<sub>3</sub>
- Holmium trichloride, HoCl<sub>3</sub>
- Iodine trichloride, ICl<sub>3</sub>
- Indium trichloride, InCl<sub>3</sub>
- Iridium trichloride, IrCl<sub>3</sub>
- Iron trichloride, FeCl<sub>3</sub>
- Lanthanum trichloride, LaCl<sub>3</sub>
- Lanthanide trichloride, LnCl<sub>3</sub>, a class of chemical compound composed of a lanthanide atom and three chloride atoms.
- Lawrencium trichloride, LrCl<sub>3</sub>, a compound synthesised in 1969 expected to follow other actinide trichlorides.
- Lutetium trichloride, LuCl<sub>3</sub>
- Manganese trichloride, MnCl<sub>3</sub>
- Molybdenum trichloride, MoCl<sub>3</sub>
- Nitrogen trichloride, NCl<sub>3</sub>, a yellow, oily, pungent-smelling liquid is most commonly encountered as a byproduct of reactions between ammonia-derivatives and chlorine
- Neodymium trichloride, NdCl<sub>3</sub>
- Neptunium trichloride, NpCl<sub>3</sub>
- Niobium trichloride, NbCl<sub>3</sub>
- Osmium trichloride, OsCl<sub>3</sub>
- Phosphorus trichloride, PCl<sub>3</sub>, a yellow solid
- Plutonium trichloride, PuCl<sub>3</sub>
- Praseodymium trichloride, PrCl<sub>3</sub>
- Promethium trichloride, PmCl<sub>3</sub>
- Rhenium trichloride, ReCl<sub>3</sub>
- Rhodium trichloride, RhCl<sub>3</sub>
- Ruthenium trichloride, RuCl<sub>3</sub>
- Samarium trichloride, SmCl<sub>3</sub>
- Scandium trichloride, ScCl<sub>3</sub>
- Tantalum trichloride, TaCl<sub>3</sub>
- Technetium trichloride, TcCl<sub>3</sub>
- Terbium trichloride, TbCl<sub>3</sub>
- Thallium trichloride, TlCl<sub>3</sub>
- Thulium trichloride, TmCl<sub>3</sub>
- Titanium trichloride, TiCl<sub>3</sub>
- Tungsten trichloride, WCl<sub>3</sub>
- Uranium trichloride, UCl<sub>3</sub>
- Vanadium trichloride, VCl<sub>3</sub>
- Ytterbium trichloride, YbCl<sub>3</sub>
- Yttrium trichloride, YCl<sub>3</sub>
- Zirconium trichloride, ZrCl<sub>3</sub>