Robert Blyth was the manager for the football club Portsmouth F.C. from 1901-1904.
Blyth was born in Glenbuck Scotland and was a member of the Glenbuck Cherrypickers, playing alongside members of his extended family.
He played as a wing-half, and his professional clubs included Rangers (1891–1894), Preston North End (1894–1899) and (1899–1901). He became player–manager of in 1901, winning the 1901-1902 Southern League title. After retiring from his post as manager, he later served as director and chairman.