There are 7 books in the Foundation series. The newest book is Forward the Foundation which came out in 1993.

1
Foundation

Book cover of Foundation
The first novel in Isaac Asimovā€™s classic science-fiction masterpiece, the Foundation series

THE EPIC SAGA THAT INSPIRED THEĀ APPLE TV+ SERIES FOUNDATION, NOW STREAMINGĀ ā€¢Ā Nominated as one of Americaā€™s best-loved novels by PBSā€™s The Great American Read
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For twelve thousand years the Galactic Empire has ruled supreme. Now itā€¦

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2
Foundation and Empire

Book cover of Foundation and Empire
The second novel in Isaac Asimovā€™s classic science-fiction masterpiece, the Foundation series

THE EPIC SAGA THAT INSPIRED THEĀ APPLE TV+ SERIES FOUNDATION

Led by its founding father, the psychohistorian Hari Seldon, and utilizing science andĀ technology, the Foundation survived the greed and barbarism of its neighboring warrior-planets. Now cleverness andā€¦

3
Second Foundation

Second Foundation

WINNER OF THE HUGO AWARD FOR BEST ALL-TIME SERIES

The Foundation series is Isaac Asimov's iconic masterpiece. Unfolding against the backdrop of a crumbling Galactic Empire, the story of Hari Seldon's two Foundations is a lasting testament to an extraordinary imagination, one that shaped science fiction as we know itā€¦

4
Foundation's Edge

Book cover of Foundation's Edge
The fourth novel in Isaac Asimovā€™s classic science-fiction masterpiece, the Foundation series

THE EPIC SAGA THAT INSPIRED THEĀ APPLE TV+ SERIES FOUNDATION

At last, the costly and bitter war between the two Foundations has come to an end. The scientists of the First Foundation have proved victorious, and now theyā€¦

5
Foundation and Earth

Book cover of Foundation and Earth

WINNER OF THE HUGO AWARD FOR BEST ALL-TIME SERIES

The Foundation series is Isaac Asimov's iconic masterpiece. Unfolding against the backdrop of a crumbling Galactic Empire, the story of Hari Seldon's two Foundations is a lasting testament to an extraordinary imagination, one that shaped science fiction as we know itā€¦

6
Prelude to Foundation

Book cover of Prelude to Foundation
The first of two prequel novels in Isaac Asimovā€™s classic science-fiction masterpiece, the Foundation series

THE EPIC SAGA THAT INSPIRED THE APPLE TV+ SERIES FOUNDATION

It is the year 12,020 G.E. and Emperor Cleon I sits uneasily on the Imperial throne of Trantor. Here in the great multidomed capital ofā€¦

7
Forward the Foundation

Book cover of Forward the Foundation
The second of two prequel novels in Isaac Asimovā€™s classic science-fiction masterpiece, the Foundation series

THE EPIC SAGA THAT INSPIRED THEĀ APPLE TV+ SERIES FOUNDATION

As Hari Seldon struggles to perfect his revolutionary theory of psychohistory and ensure a place for humanity among the stars, the great Galactic Empire tottersā€¦