Brown, 19, appeared in Los Angeles Superior Court with his lawyer on Monday. Prosecutors have said that the R&B singer attacked Rihanna, 21, during a fight last February.
Photographs of the woman were leaked to the media showing her bruised and battered.
Another court date has been set for April 29.
If Brown is convicted of the charges he could be sentenced to probation or close to five years in prison.
Since the incident Brown has lost several sponsors. Some radio stations are no longer playing his music.