The Castaways of the Flag

{{Short description|1900 novel by Jules Verne}}

{{Infobox book|

| name = The Castaways of the Flag

| title_orig = Seconde patrie

| translator = Cranstoun Metcalfe

| image = 'Second Fatherland' by George Roux 01.jpg

| caption = Title page of a Hetzel edition

| author = Jules Verne

| illustrator = Georges Roux

| cover_artist =

| country = France

| language = French

| series = The Extraordinary Voyages #47

| subject =

| genre = Adventure novel

| publisher = Pierre-Jules Hetzel

| pub_date = 1900

| english_pub_date = 1923

| media_type = Print (Hardback)

| pages =

| oclc =

| preceded_by = The Will of an Eccentric

| followed_by = The Village in the Treetops

}}

The Castaways of the Flag ({{langx|fr|Seconde patrie}}, 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.