The incident happened Thursday on a school bus that was carrying students from Reid Ross Classical School.
According to the release, twin brothers on bus #200 were showing off a pocket knife when the incident occurred.
Deputies say one of the brothers and another passenger on the bus began struggling over the knife. Deputies did not identify the passenger as a student in their news release. However, the school bus was from Reid Ross Middle School.
The deputies say the passenger was trying to take the knife from the student and give it to the bus driver.
That's when the 11-year-old student was cut on the forehead. The cut was about two inches deep.
The child was taken to the Womack Army Community Hospital for treatment.
The sheriff's office said the case will be referred to juvenile detectives to determine what charges, if any will be filed.