AJ Styles (WWE Champion) – 371 days
The Phenomenal One took SmackDown Live to new heights on his broad shoulder during his run as the longest-reigning champion with the WWE Title. He won it by defeating Jinder Mahal on an episode of SmackDown in 2017 in November to become the face of the blue brand. After defeating the likes of Shinsuke Nakamura, Kevin Owens, Sami Zayn, and more Styles continued his run until the next November where he lost the belt to heel-turned Daniel Bryan in a similar fashion.
Top 10 Interesting Facts From AJ Styles 371-Day WWE Championship Reign