"[The prison] term is nine years …. [in a] strict-regime [colony]," the judge said.
The opposition figure has also been fined 1.2 million rubles ($11,527).
Navalny's lawyer said the court's decision will be appealed.
The prosecutors were seeking 13-year imprisonment and a fine of 1.2 million rubles for Navalny on charges of fraud and contempt of court. Earlier in the day, the court issued a guilty sentence on Navalny.