The library
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Books in the Protestant Bible
39 in the Old Testament, 27 in the New — a library, not a single book.
Protestant
The story
The number depends on the canon. The Protestant Bible has 66 books. Roman Catholic Bibles include 7 deuterocanonical books for 73. Eastern Orthodox canons add more still and vary between traditions, so there is no single 'number of books in the Bible' — only a number per tradition.
How we count
Catholic canon: 73 books. Orthodox canons are larger and differ between churches.
Sources
See our full methodology on the How we count page.