Free as Air is a musical with lyrics by Dorothy Reynolds and Julian Slade and music by Julian Slade. They are the same team responsible for the much better known musical Salad Days, although Free as Air is said to be "more slick and professional by some critics". The musical is still performed, particularly by amateur companies with large casts and choruses.

Julian Penkivil Slade was an English writer of musical theatre, best known for the show Salad Days, which he wrote in six weeks in 1954, and which became the UK's longest-running show of the 1950s, with over 2,288 performances.