The 24-year-old joins a number of his compatriots in the Gulf state, putting pen to paper on a contract until 2028.
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According to widespread reports, the Jeddah outfit, backed by their country's sovereign wealth fund (PIF), paid around £25 million to sign Jota from Celtic.
After Karim Benzema and N'Golo Kante, and manager Nuno Espirito Santo, he is another big name to join Al-Ittihad.
During his two-year spell with Celtic, Jota scored 28 goals and totted up a staggering 26 assists in 83 matches.
The Celts now face the difficult task of replacing their old talisman ahead of the new season.