List of ambassadors of the United States to Iceland

Until 1874, Iceland was a dependency of Denmark rather than an independent nation. In 1874, Denmark granted Iceland home rule, which again was expanded in 1904. In 1918, The Act of Union, an agreement between Denmark, recognized Iceland as a fully sovereign state united with Denmark under a common king. Iceland established its own flag and asked that Denmark represent its foreign affairs and defense interests; thus, the United States ambassador to Denmark conducted foreign relations between the United States and Iceland.

The German invasion and occupation of Denmark on April 9, 1940, severed communications between Iceland and Denmark. As a result, on April 10, the Parliament of Iceland elected to take control of their own foreign affairs. The United States thus commissioned Lincoln MacVeagh as its first ambassador to Iceland on August 8, 1941. MacVeagh presented his credentials to the foreign minister of Iceland on September 30, 1941. His title was Envoy Extraordinary and Minister Plenipotentiary. The US has maintained continuous diplomatic relations with Iceland since then.

Following a plebiscite, Iceland formally became an independent republic on June 17, 1944.