The vast majority of professional astronomical images are distributed in FITS (Flexible Image Transport System) format, as opposed to more common image formats such as GIF or JPEG. Mathematica cannot directly handle FITS images with the Import[] function. I have therefore written a package which allows FITS data to be read into Mathematica. This package uses MathLink to call the publicly available NASA CFITSIO library.This package has been tested using Mathematica v.4.0