Amanda Bynes just pled not guilty to two counts of hit-and-run, TMZ has learned.
TMZ broke the story ... Amanda was charged with both counts of hit-and-run earlier this month after two separate incidents -- one in April, another in August -- when she allegedly smashed into other cars and fled the scene.
Prosecutors initially declined to charge Bynes for the first hit-and-run incident -- but after the actress was accused of the second hit-and-run, they reopened case #1.
The L.A. City Attorney subsequently filed charges against Bynes stemming from BOTH incidents.
If convicted on both counts, she faces up to a year in jail. She's due back in court October 19th.
FYI -- Bynes is also still facing one DUI charge and TWO charges of driving on a suspended license.