The Liberty Memorial, located in Kansas City, Missouri, USA, is a memorial to the fallen soldiers of World War I and houses The National World War I Museum, as designated by the United States Congress in 2004.Groundbreaking commenced November 1, 1921, and the city held a site dedication. The memorial was completed and dedicated on November 11, 1926.

On September 21, 2006, Secretary of the Interior Dirk Kempthorne declared Liberty Memorial a National Historic Landmark.

The memorial in Penn Valley Park was designed by Harold Van Buren Magonigle who won a design competition. Several sculptors, including Robert Aikten were involved. The approaches were designed by Wight and Wight.

By the time World War I ended on November 11, 1918, many citizens of Kansas and Missouri had lost their lives and a movement to build a monument for their sacrifices and the surviving veterans arose. A group of 40 prominent citizens formed a Memorial Association and chose lumber baron and philanthropist Robert A. Long, who had personally given a large sum of money, as president. Others included:

World War I (WWI), which was predominantly called the World War or the Great War from its occurrence until 1939 (World War II), and the First World War or World War I thereafter, was a major war centred in Europe that began on 28 July 1914 and lasted until 11 November 1918. It involved all the world's great powers, which were assembled in two opposing alliances: the Allies (based on the Triple Entente of the United Kingdom, France and Russia) and the Central Powers (originally centred around the Triple Alliance of Germany, Austria-Hungary and Italy; but, as Austria–Hungary had taken the offensive against the agreement, Italy did not enter into the war). These alliances both reorganised (Italy fought for the Allies), and expanded as more nations entered the war. Ultimately more than 70 million military personnel, including 60 million Europeans, were mobilised in one of the largest wars in history. More than 9 million combatants were killed, largely because of enormous increases in lethality of weapons, thanks to new technology, without corresponding improvements in protection or mobility. It was the sixth-deadliest conflict in world history, subsequently paving the way for various political changes such as revolutions in the nations involved.