| Iain S. Duff | |
| Birth Place: | Glasgow, Scotland |
| Nationality: | British |
| Fields: | Mathematics Computer science |
| Workplaces: | Harwell Laboratory |
| Alma Mater: | University of Oxford |
| Doctoral Advisor: | Leslie Fox Reginald Prabhakar Tewarson |
Iain S. Duff is a British mathematician and computer scientist, known for his work in numerical methods and software for solving problem with sparse matrices, in particular the Harwell Subroutine Library. From 1986 to 2009, he was the Group Leader of Numerical Analysis at Harwell Laboratory, which has moved in 1990 to the Rutherford Appleton Laboratory. He is also the Project Leader for the Parallel Algorithms Group at CERFACS in Toulouse.