The Jaffa Military Court on Sunday found Lt. Adam Malul guilty of hitting a Palestinian during an arrest operation in Kaddum, near Nablus, last year.
The IDF said that Malul was convicted of aggravated assault and of violating the army's code of conduct. He will be sentenced at a later date. During the hearing, the judge noted that Malul's actions during the operation had "crossed red lines."
At Malul's trial in September, OC Central Command Maj.-Gen. Gadi Shamni had noted that soldiers are not allowed to hit or otherwise use force in the questioning of Palestinian detainees during arrest operations in the West Bank.
"There are clear codes of conduct in Judea and Samaria on what is allowed and what is forbidden," Shamni had said. "It is all clear, and the soldiers know where the red lines are."
Yaakov Katz and AP contributed to this report.