Tannus ibn Yusuf al-Shidyaq (c. 1794 – 1861), also transliterated Tannous el-Chidiac, was a Maronite clerk and emissary of the Shihab emirs, the feudal chiefs and tax farmers of Ottoman Mount Lebanon, and a chronicler best known for his work on the noble families of Mount Lebanon, Akhbar al-a'yan fi Jabal Lubnan (The History of the Notables in Mount Lebanon). He was born in the Keserwan area of Mount Lebanon to a long line of clerks serving the Shihab emirs and other local chieftains. Tannus was taught Arabic and Syriac grammar and throughout his career serving the Shihab emirs and as a merchant, he pursued education in the fields of medicine, jurisprudence, logic, ethics, natural sciences, Turkish and Italian.
Tannus wrote manuscripts about his Maronite sect, Arab and Islamic history, the colloquial Arabic of Mount Lebanon and his family, some of which were lost. The most important of his works was Akhbar al-a'yan fi Jabal Lubnan, which was supervised by Butrus al-Bustani, and published in separate parts in 1855 and 1859. In it he described the natural and political geography of Mount Lebanon, documented the genealogies of its feudal families, and chronicled the history of its rule by families, such as the Buhturids, the Ma'ns, the Assafs, the Sayfas and the Shihabs. His chronicle has been one of the main sources for modern-day histories of Mamluk and Ottoman Lebanon.