Sir Norman Lethbridge Cowper (15 September 1896 – 9 September 1987) was an Australian lawyer best known as the Senior Partner of the legal firm of Allen Allen & Hemsley which is now Allens. Under Cowper's leadership, Allen Allen & Hemsley became one of Australia's leading law firms working for many of Australia's biggest corporations and expanded into Asia. His most notable work as a lawyer was his involvement in the successful fight by 11 trading banks against the Chifley Government's bank nationalisation legislation. He was knighted for his contribution to public affairs in 1967.