The R&B artist, 55, was convicted last September in New York of racketeering and sex trafficking crimes.
He had faced years of allegations and the judge on Wednesday said he had an "indifference to human suffering".
Lawyers for the singer, whose real name is Robert Sylvester Kelly, say he will appeal.
Ahead of his sentencing, a handful of women took the stand to confront Kelly.
A woman identified only as Angela called the singer a Pied Piper who "grew in wickedness" with every new victim, while others who were not named testified he had broken their spirits.
"I literally wished I would die because of how you made me feel," said one.
Dressed in prison khakis and dark glasses, Kelly declined to make a statement of his own and did not react as the verdict was handed down.
Federal prosecutors had recommended that Kelly be sentenced to more than 25 years in prison, given the seriousness of his crimes and "the need to protect the public from further crimes".
But his lawyers called for a sentence of 10 years - the mandatory minimum for his conviction - or less.
They portrayed Kelly as growing up poor in a household rife with domestic violence and suffering sexual abuse from a young age.
They said he was "devastated" by the sentence and planned to appeal.
Lizzette Martinez, who met Kelly when she was 17, said that there were "so many things he could have done to stop himself."
"He had all the resources; we don't have resources like that. He could have gotten help," she told BBC News.
She said he avoided justice for years due to the "power of celebrity".
"I believe that he was just making so much money for so many powerful people that they protected him."
Kelly has been in custody since he was indicted by federal prosecutors in New York and Chicago in July 2019.
His three years behind bars have been eventful, including a beating from a fellow inmate in 2020 and a bout with Covid-19 earlier this year.
The singer faces further legal action in August, when he goes on trial again, this time in Chicago on child sex images and obstruction charges.
He is also due to face sex abuse charges in courts in Illinois and Minnesota
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