Lieutenant General Sir Leonard Whitmore Thornton, (15 October 1916 – 10 June 1999) was a senior officer in the New Zealand Army.
Born in Christchurch, Thornton joined the Royal New Zealand Artillery in 1937.
He served throughout the Second World War in a number of artillery and staff posts.
Shortly after the war, he was appointed the commander of the artillery of the 2nd New Zealand Division.
After holding a series of senior posts in the New Zealand Army, including a period as its commander, he was appointed Chief of the Defence Staff in 1965 for a six-year term.
Knighted in 1967, he was later the New Zealand ambassador to the Republic of Vietnam.