"Matilda" is a song by British rock band Alt-J from their debut studio album An Awesome Wave, released on 10 January 2012 as a digital download.

It was released as a split single with "Fitzpleasure" on 24 February as a digital download and on 10" triangle-shaped vinyl.

It was written by Joe Newman, Gus Unger-Hamilton, Gwilym Sainsbury and Thom Green and produced by Charlie Andrew.

The song relates to the movie Léon (1994), specifically the relationship between the main character (a hitman) and a young girl called Mathilda.

The band would later release the song "Leon", a tribute to the main character of the film.