Harold Victor Campbell Thorby (2 October 1888 – 1 January 1973) was an Australian politician.
He was a member of the Country Party and served as the party's deputy leader from 1937 to 1940.
He represented the Division of Calare (1931–1940) and held ministerial office as Minister for War Service Homes (1934–1936), Defence (1937–1938), Civil Aviation (1938–1939), Health (1940), and Postmaster-General (1940).