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Tyrone Blackburn -- the lawyer suing Fat Joe -- has been indicted for allegedly running over a process server with a car ... TMZ has learned.

Law enforcement sources confirmed to us Blackburn has been officially indicted over the alleged May incident ... though we're told the indictment will remain sealed until his arraignment. Instagram / @tyrone_blackburn

ICYMI ... Blackburn was arrested in June after cops say he got into his vehicle while a 66-year-old process server was giving him papers connected to the Fat Joe case.

Blackburn then allegedly put the car in reverse and hit the process server in the leg ... causing a somewhat major knee injury that the server claims he needed surgery to fix. Play video content

Blackburn represents Terrance "T.A." Dix

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