Antimony (III) oxidebụ inorganic compound na usoroSb2O3. Antimony Trioxidebụ kemịkalụ mmepụta ihe ma na-apụtakwa na gburugburu ebe obibi. Ọ bụ ngwakọta azụmahịa kacha mkpa nke antimony. A na-achọta ya na okike dị ka mineral valentinite na senarmontite.ATrioxidebụ kemịkalụ eji emepụta ụfọdụ polyethylene terephthalate (PET), nke a na-eji eme ihe oriri na ihe ọṅụṅụ.Antimony Trioxidea na-agbakwụnyekwa na ụfọdụ ọkụ na-egbochi ọkụ iji mee ka ha dịkwuo irè na ngwaahịa ndị ahịa, gụnyere arịa ụlọ elu, textiles, carpeting, plastics, na ngwaahịa ụmụaka.