Duhamel is currently in a relationship with 27-year-old girlfriend Audra Mari. According to a report from Distractify, the couple began dating one another in 2017 after Duhamel and his ex-wife, Fergie, called it quits on their marriage. Before ending their marriage, Fergie gave birth to Josh's only son, Axl Jack Duhamel, whom the then-couple named after the lead singer of Guns N' Roses, Axl Rose.
Although Duhamel's divorce wasn't finalized until November 2019, he was also linked to Eiza González following his split from the musician.
Duhamel has also been romantically tied to Nicole Forrester, Heidi Mueller, Nikki Cox, and Kristy Pierce, via Ranker.
According to Distractify, Duhamel is "really happy" with Mari.