Featuring musical score composed by Harry Gregson-Williams, the soundtrack was released through Varèse Sarabande on September 23, 2014.

Having watched the original 1985 television series, Harry found that Robert McCall's character had a "smooth, cool personality" because of his English accent; however, Washington's portrayal had changed the essence of the character making it more believable and was also too similar to his role in Man on Fire (2004), which Gregson-Williams also composed for.

[2] Due to the grounded and realistic nature of the film's action, Fuqua insisted Harry to "have the score steeped in realism" and refrain from utilizing superficial, supernatural kind of music and instead lean on showcasing the character's emotions.

It was a tense music that begins in a gentle manner owing to his approach; he eventually played that theme to Fuqua which liked it but suggested that he wanted it to be even more extreme.

[5] Filmtracks.com wrote "Gregson-Williams' score only offers the absolute most basic accompaniment necessary to enhance the suspense of the environment and story.