Prof Donald Cecil Pack CBE FRSE FEIS FIMA (1920–2016) was a 20th-century Scottish mathematician who worked on supersonic airflows. He was one of the persons responsible for Strathclyde University receiving its university status and was its Vice Principal 1968 to 1972. He was one of the first to study the science associated with the sound barrier. In 1964 he was a joint founder of the Institute of Mathematics and its Applications (IMA).