The flag of Tanganyika, used between 1923 and 1961, was a British Red Ensign with a giraffe head in a white disk.

Prior to 1916, Tanganyika was a part of German East Africa and used the flag of the Reichskolonialamt.

In 1916, Tanganyika was taken from Germany as a result of the First World War and given to the United Kingdom as a League of Nations mandate.

[1] Byatt then placed the badge on a Red Ensign to be used as the official flag of Tanganyika.

[6] As a result, the Tanganyikan Red Ensign ceased to have official usage and was replaced by the flag of Tanganyika and later the flag of Tanzania though the giraffe was retained as the national animal of both successor countries.