Harald August Bohr (Copenhagen22 april 1887 – d. Dresden, 22 January 1951) was a Danish mathematician. He was the younger brother of Nobel Prize winner Niels Bohr and was Professor at the University of Copenhagen. He thanked his international fame to his work on Dirichlet Series and a study on the Riemann zeta function, nowadays known as Bohr-Landau theorem.

Among the general public was Bohr, Akademisk BKplayer, best known as footballer of the Danish team that in 1908 at the London Olympic Games in second. The Danes lost 2-0 in the final of Great Britain by hits from Frederick Chapman and Vivian Woodward.

He was the uncle of Ernest Bohr.