Spaceship Earth (or Spacecraft Earth or Spaceship Planet Earth) is a worldview encouraging everyone on Earth to act as a harmonious crew working toward the greater good.

The earliest known use of the term is a passage in Henry George's best known work, Progress and Poverty (1879). From book IV, chapter 2:

It is a well-provisioned ship, this on which we sail through space. If the bread and beef above decks seem to grow scarce, we but open a hatch and there is a new supply, of which before we never dreamed. And very great command over the services of others comes to those who as the hatches are opened are permitted to say, "This is mine!"

Around the same time, Walt Whitman in Old Age Echoes (Leaves of Grass, multiple editions between 1855 and 1891) associated:

One thought ever at the fore—
That at the Divine Ship, the World, breasting Time and Space,
All peoples of the globe together sail, sail the same voyage, are bound to the same destination.

George Orwell had earlier paraphrased Henry George in his 1937 book The Road to Wigan Pier:

The world is a raft sailing through space with, potentially, plenty of provisions for everybody; the idea that we must all cooperate and see to it that everyone does his fair share of the work and gets his fair share of the provisions seems so blatantly obvious that one would say that no one could possibly fail to accept it unless he had some corrupt motive for clinging to the present system.

In 1965, Adlai Stevenson made a speech to the United Nations, in which he said: