He's now being guarded by the police at a Boston hospital where he's undergoing a "psychological evaluation".
A statement from the Celtics says they are taking the allegations "very seriously".
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His alleged victim was reportedly taken to another hospital for treatment of injuries.
What police are calling a domestic violence incident occurred Friday night in Brighton. The Celtics recently signed Bird to a two-year contract, the first year being fully guaranteed.
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He could be arraigned as early as Monday in Brighton District Court.
A 6-foot-6, 197-pound shooting guard, Bird split time between the Celtics (13 games) and their Gatorade League affiliate, the Maine Red Claws, last season.
Felicia Gans of the Boston Globe said that comments at this time have been hard to come by.
Jabari Bird was selected by the Celtics in the second round of the 2017 National Basketball Association draft and played in 13 games for the team. "Bird's agent, Aaron Goodwin, could not be reached by cell phone on Saturday morning and did not immediately respond to a text message". That's the main thing. "How can I impact the game?"
Bird was the 56th overall pick by the Celtics out of Cal in the 2017 NBA Draft.