For me the (probably incomplete list) is:
Connie Willis: Doomsday Book (three times)
Neal Stephenson: Cryptonomicon, Anathem, Quicksilver, The Confusion, The System of the World (twice or three times)
Frank Herbert: Dune (three times)
Tolkien: Lord of the Rings (three times)
Stephen King: Salem's Lot, The Shining, It (three times each)
Stephen King & Peter Straub: The Talisman (twice)
Vernor Vinge: A Deepness in the Sky, A Fire Upon The Deep, Rainbow's End (each twice)
Tracy Kidder: The Soul of a New Machine (twice)
Larry McMurtry: Lonesome Dove (twice)
Ross Thomas: Chinaman's Chance (twice)
William Gibson: Neuromancer, The Peripheral, Agency (each twice)
Most of Raymond Chandler and Dashiel Hammet I've read multiple times. I've read Brautigan's Dreaming of Babylon a bunch of times too.
All of William Gibson. Miyazaki's Nausicaä of The Valley of Wind, in various languages. Stephen Cosgrove's Muffin Muncher, I couldn't say how many times I must have read that (It appears they've now changed the title to Muffin Dragon).
I've read The Soul of a New Machine a couple of times too. The Hitchhiker's and Dirk Gently's trilogies a few times.
Stefano Benni's Baol probably half a dozen times. And Acts of The Apostles by John FX Sundman a bunch too. Oh, and a few of Martin Gardner's books. And Smullyan's To Mock a Mockingbird.
And most probably also many others. Most of my books are now in boxes or have been gifted away, though.
It is the second series in the same world, and all the people have grown up. The kids became parents and think like responsible adults. It talks in an adult way about quite a few horrific events, without overdoing it. It gave child me an idea about what the difference actually was.
Apart from that, it had an interesting magic system.
Philip K. Dick: Ubik, Flow My Tears The Policeman Said, A Scanner Darkly, etc. too many to count (many more than twice)
William Gibson: everything at least twice
Neal Stephenson: Snow crash (three times, I think)
Clifford D. Simak: City
H. P. Lovecraft: everything at least twice. There is a French compilation of The Dream-Quest of Unknown Kadath, The Silver Key, and Through the Gates of the Silver Key that I've read countless times. I've used two editions and I'm at my third.
Maurice G. Dantec: Babylon Babies (three times)
Possibly many others.
- Flowers for Algernon by Daniel Keyes (thrice)
- The Color of Distance by Amy Thomson (twice)
- Fox 8 by George Saunders (twice)
Highly recommended to those who haven't read it!
Kim Stanley Robinson's The Wild Shore is another repeat favourite.
2. Flowers for Algernon by Daniel Keyes [1]
3. Frankenstein; or, The Modern Prometheus by Mary Shelley
4. I'm Glad My Mom Died by Jennette Mccurdy
5. Letter to a Christian Nation by Sam Harris
6. Things Fall Apart by Chinua Achebe [2]
7. Cosmos by Carl Sagan
8. The Greatest Show on Earth: The Evidence for Evolution by Richard Dawkins [3]
9. A Short History of Nearly Everything by Bill Bryson
10. The New Jim Crow: Mass Incarceration in the Age of Colorblindness by Michelle Alexander [4]
11. The Metamorphosis by Franz Kafka
12. Billions and Billions: Thoughts on Life and Death at the Brink of the Millennium by Carl Sagan [5][6][7]
13. Outgrowing God: A Beginner’s Guide to Atheism by Richard Dawkins
[1] https://news.ycombinator.com/item?id=50076596
[2] https://news.ycombinator.com/item?id=47452253
[3] https://news.ycombinator.com/item?id=48326741
[4] https://news.ycombinator.com/item?id=49539535
[5] https://news.ycombinator.com/item?id=49751771
[6] https://news.ycombinator.com/item?id=49740712
[7] https://news.ycombinator.com/item?id=49739256
Most of these are old since I’ve been reading more articles these days but here are a few good books or series I’ve read more than twice: The Hobbit, LOTR, the Silmarillion, Neuromancer, the Chronicles of Narnia, Hong Lou Meng, The Heart Sutra, The Bhagavad Gita, The Tao De Ching, The Wheel of Time series, No country for old men, Persuasion, Sense & Sensibility, Pride & Prejudice, The Way of Kings, The Talisman, the Dark Tower Series, and The Prophet.