Ahmed Ahmed is Free Free ... Domestic Violence Case Dropped

Ahmed Ahmed -- a well-known comic who stars in TBS's "Sullivan & Son" will NOT be charged with domestic violence ... TMZ has learned.

Ahmed was arrested last month after cops responded to a 911 domestic violence call at his house. Cops say his girlfriend had visible marks so Ahmed was cuffed and booked on felony domestic violence.

The case eventually made its way to the L.A. City Attorney for misdemeanor prosecution, but we've learned the City Attorney will formally reject the case today based on insufficient evidence.

As for the problems in the case ... we're told there is a witness who says the GF did NOT have visible marks on her body. Also, both the girlfriend and Ahmed called 911 which muddies the waters.