Sir Arthur Willert, KBE (19 May 1882 – 11 March 1973) was a British journalist and public servant.
Joining the staff of The Times in 1906, Willert was The Times's chief United States correspondent from 1910 to 1920, with an interruption from 1917 to 1918, when he was Secretary of the British War Mission in Washington and the representative of the Ministry of Information.
He formed an extensive network of influential American contacts, which enabled him to supply the British government with valuable information concerning American politics during the First World War and to convey British views to American officials.
Willert was appointed a KBE in 1919 "For valuable services rendered in connection with the War".
On the outbreak of the Second World War, he became the head of the Ministry of Information Office for the Southern Region, serving until 1945.