Iran Press/ Middle East: The French forward announced his departure from the Spanish club last weekend, bringing a 14-year spell to an end during which he won La Liga on four occasions and the Champions League five times.
Al Ittihad are managed by former Wolves and Tottenham boss Nuno Espirito Santo and finished five points ahead of Cristiano Ronaldo's Al Nassr - who came second - last season.
Al Ittihad posted a video on Twitter of Benzema signing a contract until 2026, although the club did not disclose any financial details.
"I am excited to experience a new football league in a different country," the 35-year-old, who will wear the No 9 shirt, said.
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