The well-known publicist is the first high-profile person to be convicted under Operation Yewtree, a Scotland Yard probe launched over sexual assaults dating back many years.
The 71-year-old was found guilty of eight counts of indecent assault relating to four women between 1977 and 1984.
Judge Anthony Leonard, during the sentencing, said Clifford, who had also represented Bollywood actress Shilpa Shetty soon after her 'Celebrity Big Brother' win in 2007, had "groomed and degraded" his victims. He said Clifford had thought he was "untouchable."
Clifford was arrested by detectives in December 2012 and charged in April 2013.
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Clifford's victims included a dancer assaulted in a toilet and a model who said Clifford groped her when she went to his office for career advice in 1983.
During the trial, prosecutors portrayed him as a well-practised manipulator, who promised to boost his victims' careers and get them to meet celebrities in exchange for sexual favours.