The court handed Hussam Qawasmeh three life sentences, one for each teen, today.
Eyal Yifrah, 19, Gilad Shaar, 16, and Naftali Fraenkel, a 16-year-old with dual Israeli-American citizenship, were abducted and killed in June while hitchhiking home in the West Bank.
Israel launched an extensive search operation and arrested hundreds of Hamas members in the West Bank.
Hamas stepped up rocket fire on southern Israel, prompting a military response that escalated into a 50-day war.