/s/ may refer to:

• Signature, a mark that a person writes on documents as a proof of identity and intent
• Voiceless alveolar sibilant, a type of voiceless alveolar fricative

• Surat al-Masad
• Surat al-Ma'un
• Surat al-Muddaththir
• Surat al-Mujadala
• Surat al-Mulk
• Surat al-Mumtahana
• Surat al-Munafiqun
• Surat al-Mursalat
• Surat al-Mutaffifin
• Surat al-Muzzammil
• Surat al-Naba'
• Surat al-Najm
• Surat al-Nas
• Surat al-Nasr
• Surat al-Nazi'at
• Surat Al-Nur
• Surat al-Qadr
• Surat al-Qalam
• Surat al-Qamar
• Surat al-Qari'a
• Surat al-Qiyama
• Surat al-Rahman
• Surat al-Rum
• Surat al-Saff
• Surat al-Saffat