Frank William Walbank, CBE (10 December 1909 – 23 October 2008) was a scholar of ancient history, particularly the history of Polybius. He was born in Bingley, Yorkshire and died in Cambridge.
Walbank studied Classics at Peterhouse, Cambridge, and from 1951 to 1977 was Rathbone Professor of Ancient History and Classical Archaeology at the University of Liverpool. He was also professor emeritus at Liverpool and an Honorary Fellow of Peterhouse.
He held visiting positions at the University of Pittsburgh, the University of California, Berkeley, and the Institute for Advanced Study in Princeton.
His published works include Aratos of Sicyon (1933), Philip V of Macedon (1940), The Awful Revolution (1946; 1969), Polybius (1972; 1990), A Historical Commentary on Polybius, 3 vols. (1957, 1967, 1979), The Hellenistic World (1981) and, with N.G.L. Hammond, A History of Macedonia, Vol. III: 336–167 BC. He also served as the joint editor of volumes 7 and 8 of the Cambridge Ancient History.
His essay "Aratos of Sicyon" won the Cambridge University Thirlwall Prize in 1933.