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The Arabic letter غ (Arabic: غين ghayn or ġayn) is the nineteenth letter of the Arabic alphabet, one of the six letters not in the twenty-two akin to the Phoenician alphabet (the others being thāʼ, khāʼ, dhāl, ḍād, ẓāʼ). It is the twenty-second letter in the new Persian alphabet. It represents the sound /ɣ/ or /ʁ/. In Persian language it represents [ɣ]~[ɢ]. In name and shape, it is a variant of ʻayn (ع). Its numerical value is 1000 (see Abjad numerals).
A voiced velar fricative /ɣ/ or a voiced uvular fricative /ʁ/ (usually reconstructed for Proto-Semitic) merged with ʻayin in most languages except for Arabic, Ugaritic, and older varieties of the Canaanite languages. Canaanite languages and Hebrew later also merged it with ʻayin, and this merger was complete in Tiberian Hebrew. The South Arabian alphabet retained a symbol for ġ, .
The letter ghayn (غ) is sometimes used to represent the voiced velar plosive /ɡ/ in loan words and names in Arabic and is then often pronounced /ɡ/, not /ɣ/. Other letters, such as ج, ق, ک/ك (also گ, ݣ, ݢ, ڨ, ڠ, instead of the original Arabic letters), can be used to transcribe /ɡ/ in loan words and names, depending on whether the local variety of Arabic in the country has the phoneme /ɡ/, which letter represents it if it does, and on whether it is customary in the country to use that letter to transcribe /ɡ/. For instance, in Egypt, where ج is pronounced as [ɡ] in all situations, even when speaking Modern Standard Arabic (except in certain contexts, such as reciting the Qur'an), ج is used to transcribe foreign [ɡ] in virtually all contexts. In many cases غ is pronounced in loan words as expected—/ɣ/, not /ɡ/—even though the original language had /ɡ/.
When representing this sound in transliteration of Arabic into Hebrew, it is written as ע׳.
In English, the letter غ in Arabic names is usually transliterated as ‹gh›, ‹ġ›, or simply ‹g›, e.g. بغداد Baghdād 'Baghdad', or غزة Ghazzah 'Gaza', the latter of which does not render the sound [ɣ]~[ʁ] accurately. The closest equivalent sound known to most English speakers is the Parisian French "r" [ʁ].
Ghayn is written is several ways depending in its position in the word:
|Position in word:||Isolated||Final||Medial||Initial|
|Unicode name||ARABIC LETTER GHAIN|
|UTF-8||216 186||D8 BA|
|Numeric character reference||غ||غ|