Harold Charles Bold (1909–1987) was an American botanist.
He earned his Bachelor of Arts from Columbia University in 1929, Phi Beta Kappa.,[1] his Master of Science from the University of Vermont in 1931, and his Ph.D. in botany in 1933 at Columbia.
He married Mary E. Douthit on June 8, 1943.
After 1957 he taught botany at the University of Texas at Austin.
His work focused on sub-aerial and soil algae.