Gabriel Sionita (Syriac: Jibrā'īl aṣ-Ṣahyūnī; 1577, at Ehden in Lebanon – 1648, in Paris) was a learned Maronite, famous for his role in the publication of the 1645 Parisian polyglot of the Bible.
Although Sionita came to Rome at the age of seven, he always considered Arabic as his mother tongue. In Rome, he learnt Latin and Syriac, and acquired a slight knowledge of Hebrew. He studied theology, but only went into the priesthood later, in Paris, aged 45.
Savary de Breves was French ambassador to Turkey and was interested in Oriental studies. When recalled from Rome, he took two Maronites with him to Paris, to assist in the publication of the polyglot under the auspices of de Thou, the royal librarian, and Cardinal Duperron. The two Maronites were Gabriel Sionita and John Hesronita, Gabriel being the more prominent of the two. They received an annual stipend of 600 livres, and Gabriel was appointed to the chair of Semitic languages at Sorbonne.
Both de Thou and Duperron died within four years, and serious financial difficulties arose. In 1619, the assembly of French clergy at Blois granted 8,000 livres to support the undertaking; but through some malversation of funds, this money was never actually paid; at least, such is the accusation brought by Gabriel in his preface to the Syriac Psalter, which he published. The Maronites seem to have become involved in pecuniary embarrassments, which led to feuds with the leaders of the undertaking. In 1619, however, by royal diploma, Gabriel's stipend had been raised to 1,200 livres. The following year he received the a doctorate, and two years later, the priesthood.
In 1626, as Gabriel held no classes owing to the lack of students, his stipend was curtailed. After some time, however, he was paid on the original offer; and in 1629, his salary was increased to 2,000 livres. In 1630, he recommenced work on the polyglot. He did not apply himself fully to the work, and was even accused of carelessness in the work. He again found himself in difficulties.