Arsenic sulfide may refer to:

• Arsenic trisulfide, As2S3, the mineral orpiment
• Arsenic pentasulfide, As2S5, similar structure to phosphorus pentasulfide (β-P2S5)
• Tetraarsenic tetrasulfide, As4S4 (2 isomers):
  • the mineral realgar
  • the mineral pararealgar
• Tetraarsenic trisulfide, As4S3, the mineral α- or β- dimorphite