Born and raised in Minot, North Dakota, Josh attended Minot State University, playing collegiate-level football and basketball. He planned to attend dental school but dropped out one-and-a-half credits shy of his undergraduate degree. After college, he followed an ex-girlfriend to northern California, and in 1997, he won the title of Male Model of the Year in an International Modeling and Talent Association (IMTA) competition.

He then decided to pursue acting and won the role of Leo du Pres on the ABC soap opera "All My Children." His work on the show, especially his character's pairing with Greenlee Smythe, garnered critical acclaim. He earned a Daytime Emmy Award nomination for the Special Fan Award for America's Favorite Couple in 2002, shared with Budig, and a Daytime Emmy Award for Outstanding Supporting Actor for his portrayal of Leo du Pres.

In 2003, Duhamel landed a prime time role on the NBC show "Las Vegas," playing the head of security for the Montecito Casino. He made his big-screen acting debut in 2004's "Win a Date with Tad Hamilton!" and continued on to star in the thriller "Turistas." After watching an episode of "Las Vegas" in which Duhamel's character had just returned from the war in Iraq, Steven Spielberg handpicked him for the role of Captain William Lennox in 2007's summer blockbuster film "Transformers." Duhamel reprised the role for the sequels, "Transformers: Revenge of the Fallen," "Transformers: Dark of the Moon," and "The Last Knight."

Duhamel was the official pace car driver for the 2009 Indianapolis 500 driving the 2010 Chevrolet Camaro Pace Car. In 2010, he played the lead role in the film "When in Rome" as Nick Beamon.

In 2013, Duhamel hosted the 2013 Kids' Choice Awards, which was broadcast live from Los Angeles, California. He then appeared in "Safe Haven," co-starring Julianne Hough.

n 2016, he starred as Frank Dunning in the Hulu science fiction thriller miniseries "11.22.63."

In 2018, he was used on a Taco Bell commercial to advertise Mexican spiced fries with nacho cheese sauce called Web of Fries. Later that year he starred in the romantic comedy-drama film, "Love, Simon."

In 2019, Duhamel's directorial debut ‘Buddy Games’ was bought by Saban Films. The movie starred Duhamel, Olivia Munn, Dax Shepard, Kevin Dillon, James Roday, Nick Swardson and Dan Bakkedahl.

In 2020, Duhamel starred in "The Lost Husband" and "Think Like a Dog."

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