Brown pleaded guilty to misdemeanor assault and was sentenced to time served. He spent two days in a Washington jail in this case.
The Grammy-winning singer was arrested in October. The victim told police Brown hit him after he tried to get in a picture the singer was taking with two women.
Brown had previously pleaded not guilty in the case. His trial had been set for April, but it was delayed.
Because Brown was still on probation, the outcome of his Washington case had potential repercussions in California. During a court hearing in May, a Los Angeles judge sentenced Brown to serve an additional 131 days in jail. He was released in June.
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Brown's attorney, Danny Onorato, argued that Brown had already been punished extensively for the assault, noting the time he spent in jail in California and four months he spent receiving inpatient counseling after his probation was revoked.
Brown spoke only briefly, saying: "I would like to say to the court that I'm sorry." He did not comment as he left court, swarmed by photographers and a handful of fans.
Brown's bodyguard, Christopher Hollosy, was also charged in the same Washington scuffle. He was accused of being the second person after Brown to strike Parker Adams outside the W hotel. Hollosy was convicted of misdemeanor assault in April. He has not yet been sentenced.
Brown broke a window after a 2011 "Good Morning America" interview in New York and was accused of snatching a woman's cellphone in Miami after she tried to snap pictures of the singer.