Charles Royal Johnson (born January 28, 1948) is an American mathematician specializing in linear algebra.

He was a Class of 1961 professor of mathematics at College of William and Mary.

In 1972, he received a Ph.D. in Mathematics and Economics from the California Institute of Technology, where he was advised by Olga Taussky Todd; his dissertation was entitled "Matrices whose Hermitian Part is Positive Definite".

[5] Johnson held various professorships over ten years at the University of Maryland, College Park starting in 1974.

[citation needed] He was a professor of mathematics at the College of William and Mary from 1987 to 2024.