Common Pleas Judge Genece Brinkley on Friday denied a motion to allow the 30-year-old rapper to be bailed out of a Pennsylvania correctional facility.
Mill's attorney says they plan to appeal her ruling, saying it continues a "long pattern of unfair treatment."
Her decision comes after the state Superior Court last week told her to act "without further delay" on a 2-week-old request to free the rapper.
Mill was sentenced last month to two to four years for violating probation on a roughly decade-old gun and drug case.
Mill's probation officer and a prosecutor had recommended he not be jailed.
His imprisonment has sparked backlash in opinion pieces, rallies, billboards and bus ads.
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