Ḥarsūsī (Arabic: لغة حرسوسية) or Ḥersīyet[4] (pronunciation in Harsusi: [ħʌrsiːjət][5]) is a Semitic language of Oman, spoken by the Harasis people.

It is classified as a moribund language,[6] with an estimated 600-1000 speakers in Jiddat al-Harasis, a stony desert in south-central Oman.

[7] Harsusi, like all the Modern South Arabian languages, is unwritten,[6] though there have been recent efforts to create a written form using an Arabic-based script.

[9] Because the Harasis people were for centuries the only human inhabitants of Jiddat al-Harasis, the language developed in relative isolation.

[10] However, as most Harasis children now attend Arabic-language schools and are literate in Arabic, Harsusi is spoken less in the home, meaning that it is not being passed down to future generations.