The former head of the UK Independence Party "will offer political analysis" for Fox News Channel and Fox Business Network, a statement said.
Farage has been closely aligned with Donald Trump and last month visited the president-elect at Trump Tower in New York.
Brexiteer Farage says he wants to be a bridge between UK and Trump
He campaigned on behalf of Trump last year, believing the real estate tycoon and former reality TV star had tapped into similar anger over globalization and ruling elites as the anti-EU campaign in Britain.
Trump rewarded his loyalty by recommending that Farage serve as British ambassador to the United States, irritating Downing Street.
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