Harold Victor Campbell Thorby 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). He lost his seat at the 1940 federal election.

The National Party of Australia, also known as The Nationals or The Nats, is a centre-right, agrarian political party in Australia. Traditionally representing graziers, farmers, and regional voters generally, it began as the Australian Country Party in 1920 at a federal level.