Police arrested the man, Billy Joe Lewis-Kubisiak, around 8:30 p.m. Saturday. He pulled a knife and made threatening gestures regarding food distribution. No one was hurt.
Police said the 23-year-old was intoxicated and not a member of the Occupy Austin protest.
Lewis-Kubisiak has been charged with aggravated assault.
The Occupy Austin protest continues into its third week. Sunday, those who took part were moved to the median in front of city hall because of another activity.
Organizers have Occupy Austin events planned through Nov. 7.