Glyn Harman (born 2 November 1956) is a British mathematician working in analytic number theory.= One of his major interests is prime number theory. He is best known for results on gaps between primes and the greatest prime factor of p + a, as well as his lower bound for the number of Carmichael numbers up to X. His monograph entitled Prime-detecting Sieves was published by Princeton University Press. He has also written a book entitled Metric Number Theory, and he has in addition contributed to the field of Diophantine approximation.
Harman is currently a professor at Royal Holloway, University of London. Previously he was a professor at Cardiff University.
Harman is married, and has three sons, and lives in Wokingham, Berkshire.