On 25 June 2013, it was announced that Barlow had been signed up to work on a new musical version of Finding Neverland and will co-write the score for the theatre project, which is being developed by Hollywood producer Harvey Weinstein. Barlow said of the project: "This is something I've always wanted to do so it's a real privilege to be involved. I'm really enjoying working with the team and I love the story; it's also great to be working with a legendary creative like Harvey Weinstein." Weinstein echoed the sentiment by expressing his admiration for Barlow, whom he described as "one of the finest songwriters in the world". On 1 March 2014, Barlow attended the Bob and Harvey Weinstein's pre-Academy Awards party at the Montage in Beverly Hills to perform a selection of songs from the musical score he had written for Finding Neverland. He played the lead role of Peter Pan author J. M. Barrie, and sung a duet with noted British musical actress Laura Michelle Kelly along with four back-up artists featured in the Oscar-nominated documentary 20 Feet from Stardom. Barlow's performance was well received, and after a successful performance run in Boston, Finding Neverland opened on Broadway in spring 2015. On its first Broadway preview, the show sold out the theatre and posted a box office performance that, if it continued for a whole week of performances, would have seen the show top $1 million. Gary has also co-written a musical alongside hometown friend Tim Firth, titled The Girls, which opened at the Phoenix Theatre, London in January 2017.

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Gary has also co-written a musical alongside hometown friend Tim Firth, titled The Girls, which opened at the Phoenix Theatre, London in January 2017.