The world champion was forced to miss the Sakhir Grand Prix last weekend due to his infection with the virus, but tests in recent days have shown him that it is now clear.
The end of his quarantine period and signing with negative tests means he will return to Mercedes for the F1 season finale.
A statement from Mercedes said: “Lewis tested negative for COVID-19 on Wednesday before his period of self-isolation in Bahrain ended.
“It got him to Abu Dhabi on Thursday afternoon, and he tested negative when he arrived.
“Lewis has therefore fulfilled the protocols required by the FIA for his entry into the paddock tomorrow and will be able to participate in the race weekend. ”
Hamilton’s return to action means Russell, who replaced him in Bahrain last weekend, will return to Williams for the final round of the season.
Russell narrowly missed pole position against his Mercedes team-mate Valtteri Bottas and was on the verge of winning before a botched pit stop during a safety car period.
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Hamilton’s return also means that Williams’ reserve driver Jack Aitken will step down after making his F1 debut at the Sakhir GP.
Hamilton had to pass a number of negative coronavirus tests in Bahrain before being free to leave the country.
After arriving in Abu Dhabi, he had to self-quarantine before getting confirmation of another negative test.
The FIA said he was not granted any specific waivers and that he must follow standard procedures for everyone.
“The FIA COVID-19 protocols remain clear and have not changed,” the FIA said.
“A negative pre-test result is required to gain access to the Formula 1 paddock as indicated in appendix S of the International Sporting Code and another negative test result no more than 24 hours after arrival is required.
“Lewis, after testing negative in Bahrain and Abu Dhabi, will have access to the Paddock. ”
Hamilton’s absence from the Sakhir Grand Prix last weekend was the first F1 race he had missed since making his 2007 Australian Grand Prix debut.
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