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On the October 26 episode of Raw, Reigns won a fatal four-way match (also involving Alberto Del Rio, Dolph Ziggler and Kevin Owens) to become the number one contender for the WWE World Heavyweight Championship.
However, on November 4, then champion Seth Rollins legitimately injured his knee and vacated the title, which led to a tournament to crown a new champion.
Following this, Triple H attempted to persuade Reigns into joining The Authority by offering him a bye into the tournament finals which Reigns declined.
He then defeated Big Show in the first round, Cesaro in the quarterfinals, Alberto Del Rio in the semifinals and Dean Ambrose in the finals at Survivor Series, to win the WWE World Heavyweight Championship for the first time.
Triple H attempted to offer congratulations, but Reigns hit him with a spear and Sheamus then cashed in his Money in the Bank contract and pinned Reigns, thus ending Reigns' reign at only 5 minutes.
Reigns then failed to regain the title from Sheamus in a Tables, Ladders, and Chairs match at TLC, after being helped by his fellow League of Nations members Alberto Del Rio and Rusev; subsequently, Reigns would attack the trio and also Triple H, who came out to stop him.
The next night on the December 14 episode of Raw, Mr. McMahon granted Reigns a title rematch against Sheamus, with Reigns' career on the line, and after overcoming McMahon, Del Rio and Rusev's interferences, Reigns defeated Sheamus and regained the WWE World Heavyweight Championship.
On the January 4, 2016 episode of Raw, Reigns successfully defended his title against Sheamus, despite McMahon acting as the special guest referee.
Reigns was then slated to defend his title in the Royal Rumble match at the Royal Rumble pay-per-view, where Reigns scored a total of five eliminations after entering first, heading backstage for much of the match after an attack by the League of Nations, and was eliminated upon his return by eventual winner Triple H, thus losing the world title.
At Fastlane, Reigns pinned Dean Ambrose in a triple threat match also involving Brock Lesnar, to receive a WWE World Heavyweight Championship match against Triple H at WrestleMania 32, where he defeated Triple H in the main event to become the WWE World Heavyweight Champion for a third time.
Earlier in March 2016, Reigns changed his ring entrance to the entrance ramp (a default like other wrestlers) instead of coming out through the crowd.
For this third world title reign, Reigns had two successful televised title defenses in May against AJ Styles at Payback and then Extreme Rules.
Right after the Extreme Rules match against Styles, Reigns was attacked by a returning Seth Rollins.
Near the end of his reign, the 2.03 TV rating for the June 13 episode of Raw which he appeared in was the lowest since March 3, 1997.
At Money in the Bank on June 19, Reigns was defeated by Rollins, ending his title reign at 77 days.
On June 21, 2016, Anoaʻi was suspended for 30 days for his first violation of WWE's Wellness Program. In response, he apologized on Twitter.
WWE's Wellness Program uses drug testing to detect substance abuse.
Pro Wrestling Torch reported that WWE knew of Reigns' violation before Money in the Bank, leading to Reigns being scripted to lose his world title at the event.
