Robert Dennis Madge is an English actor, writer & musical theatre performer. Madge first rose to prominence as a child actor, appearing as Michael Banks in Mary Poppins at the Prince Edward Theatre, they then went on to appear in various musical including appearing as Gavroche in the Les Miśerables 25th Anniversary Concert.

Les Misérables in Concert: The 25th Anniversary was performed and filmed at The O2 Arena in North Greenwich, London, England, on 3 October 2010 at 1:30 pm and 7:00 pm. It marked the 25th anniversary of the original West End production of Les Misérables, which was based on Victor Hugo's 1862 novel, and has been running since October 1985.