NFL's Chris Clemons Charged With Assault

NFL safety Chris Clemons has been charged with assault after he allegedly knocked out a woman outside a Scottsdale club in May ... TMZ Sports has learned.

Clemons -- who last played for the Arizona Cardinals -- was accused of punching a woman in the face after she got into an altercation with one of his female companions.

Cops spoke to Clemons at the scene -- but didn't realize he was the guy they were looking for, so they let him go. The strange interaction was captured on a body camera.

According to court records, Clemons was charged with assault causing physical injury -- a misdemeanor that could land him in county jail for up to 6 months.