Who were the 40 men who wrote the Bible? Jehovah's Witnesses believe that the Bible is made up of "66 smaller books". God used about "40 faithful men" to write them. According to them, the first five books were written by Moses about 3,500 years ago; the last book was written by the apostle John over 1,900 years ago. God communicated with the Bible writers by means of the holy spirit. They wrote down the thoughts of God, not their own thoughts. So "Jehovah" is the author of the Bible, according to Jehovah's Witnesses.


Who were the 40 faithful men?
The 40-author count is not unique to Jehovah's Witnesses, so I'll provide the names of the forty commonly-accepted authors. Note that the authorship of some books (Hebrews, for example) is debated, so the number and names vary slightly depending on which scholars you ask.


Moses
Joshua 
Samuel 
Ezra
Jeremiah 
Nehemiah 
Mordecai 
Job 
Sons of Korah
Asaph
Heman
Ethan
Hezekiah
David 
Solomon 
Agur  
Lemuel  
Isaiah 
Ezekiel  
Daniel  
Hosea  
Joel  
Amos 
Obadiah  
Jonah  
Micah  
Nahum  
Habakkuk  
Zephaniah  
Haggai  
Zechariah 
Malachi  
Matthew  
John  
Mark  
Luke
Paul  
James  
Peter 
Jude


See When was the Bible written and who wrote it? for a matchup of names to books, along with approximate dates of authorship.