Iannone was born in Vasto, Province of Chieti, and began racing on pocket bikes before progressing to national and international competition. He entered the 125cc World Championship in 2005 and took his first win at the Chinese Grand Prix in Shanghai in May 2008. In the 2009 125cc season he won the opening two races and finished seventh overall.
Moving to the new Moto2 class in 2010, Iannone took victories at Mugello and Assen — both from pole position — and won again at Motorland Aragón, making him one of the class's early standout performers. Over three seasons in Moto2 he accumulated eight race wins and finished third in the championship standings three consecutive times. He earned the nickname "Crazy Joe" for his aggressive riding style, later updated to "The Maniac."
Iannone joined MotoGP in 2013 with Pramac Racing on a satellite Ducati Desmosedici. He finished twelfth in his first season, his best result an eighth at Phillip Island, though a shoulder injury in Germany disrupted the latter part of the campaign.
Promoted to the Factory Ducati Team for 2015 alongside Andrea Dovizioso, Iannone achieved his first MotoGP podium at the season-opening Qatari Grand Prix. He finished fifth in the championship that year with 188 points, his best points total in MotoGP.
The 2016 Austrian Grand Prix represented the high point of his career. Iannone dominated the weekend, finishing in the top two of every session bar the opening practice, starting from pole position, and winning by 0.938 seconds over teammate Dovizioso. The result was Ducati's first MotoGP victory since 2010. Despite this breakthrough, the season was marked by inconsistency and he missed four races after fracturing a vertebra at the San Marino Grand Prix, finishing ninth overall.
Iannone signed with Suzuki for two seasons from 2017, partnering MotoGP rookie Álex Rins. The 2017 season was difficult, yielding 70 points and thirteenth in the championship. In 2018 he improved significantly, accumulating 133 points and four podium finishes to finish tenth overall before announcing mid-season that he would leave Suzuki.
Iannone joined Aprilia for 2019 alongside Aleix Espargaró. He scored 43 points in 16th place, finishing behind his teammate, in what proved to be his final full MotoGP season.
In December 2019, Iannone was provisionally suspended after testing positive for Drostanolone. In March 2020 he received an 18-month ban and was retroactively disqualified from the final two rounds of the 2019 season. Iannone argued that the positive test resulted from unknowingly eating contaminated meat in Malaysia. The Court of Arbitration for Sport, however, found his arguments insufficient to establish unintentional violation and extended the ban to four years in November 2020, ruling him out of racing until December 2023.
After the ban expired, Iannone returned to competition in the Superbike World Championship in 2024 with Team GoEleven on a Ducati Panigale V4 R, finishing eighth overall with five podiums including one victory. He made a brief MotoGP return at the Malaysian round as a temporary substitute for the injured Fabio Di Giannantonio at the Pertamina Enduro VR46 Racing Team. In 2026 he joined the inaugural Harley-Davidson Bagger World Cup.
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