Alagöz (Syriac: ܒܝܬ ܩܘܢܨܛܢ, Bêṯ Qû(n)ṣṭan (Beth Qustan), literally 'The House of Constantine') is an Assyrian/Syriac village in the Mardin Province of Turkey. It is located 26 kilometres from Midyat.