Wikimedia Commons/Harry Potter HBO Max TV New Harry Potter series on HBO Max Christmas 2026. See the first look & 5 key insights from the behind-the-scenes preview, promising a deeper, more expansive... April 6, 2026 AceShowbiz - The highly anticipated Harry Potter series is set to debut on HBO Max at Christmas 2026, bringing a fresh adaptation of J.K. Rowling's iconic novels. On April 5, HBO Max released a revealing preview titled Finding Harry: The Craft Behind the Magic, offering fans an exclusive behind-the-scenes look at the making of the reboot's first season.