Charles R. Leedham-Green is a retired professor of mathematics at Queen Mary, University of London, known for his work in group theory.

[1] His parents were John Charles Leedham-Green (1902–1984), a surgeon and general practitioner in Southwold, and Gertrude Mary Somerville Caldwell.

[2] With Leonard Soicher, Leedham-Green designed the product replacement algorithm;[3] an algorithm within computational group theory that generates random elements of groups by taking a random walk through the group.

He is responsible for a great body of work in group theory.

The 300th edition of the Journal of Algebra was dedicated to him for his 65th birthday.