Dorothy Margaret Greig née Hannah (1922–1999) was an English mathematician who worked upon the theory of worsted spinning, especially the superdraft system invented by Geoffrey Ambler.^[1] During WW2, she worked on the analysis of strategic bombing.^[1] She married in 1948 and started lecturing at Leeds University in the same year.^[1] She subsequently lectured at Constantine Technical College and Durham University.^[1]