The Castaways of the Flag (, lit. Second Fatherland, 1900) is an adventure novel written by Jules Verne. The two volumes of the novel were initially published in English translation as two separate volumes: Their Island Home and The Castaways of the Flag. Later reprints were published under the title The Castaways of the Flag.
The story is a sequel to the 1812 book The Swiss Family Robinson by Johann Wyss, picking up where that novel leaves off.