I love a lot of books. Some of them are (alphabetically because I don't have another way of ranking them),

Douglas Adams, The Hitchhiker trilogy in all parts (except the counterfeit sixth)
Aristophanes, Lysistrata and The Frogs
Jane Austen, Persuasion and Pride and Prejudice
Roland Barthes, Mythologies
Charles Baudelaire, Petites Poémes en Prose
Walter Benjamin, Childhood in Berlin around 1900
Samuel Beckett, Endgame
Jens Bjørneboe, Politi og anarki
Jorge Luis Borges, all of it, dammit.
Mikhail Bulgakov, The Master and Margarita
Italo Calvino, Invisible Cities
Helen DeWitt, The Last Samurai
Arthur Conan Doyle, Sherlock Holmes (yes, all of it)
Alexandre Dumas, Les Trois Mousquetaires, Vingt Ans Aprés and Le Vicomte de Bragelonne
Umberto Eco, The Name of the Rose and Foucault's Pendulum
Nick Harkaway, The Gone-Away World
Herodotos, Histories
Kazuo Ishiguro, The Remains of the Day
Frank Key, Unspeakable Desolation Pouring Down from the Stars
Stanislaw Lem, Cyberiad and His Master's Voice
Alan Moore, Watchmen
Friedrich Nietzsche, Ecce Homo and the rest.
Baroness Orczy, The Scarlet Pimpernel
Ovid, Heroides
Terry Pratchett and Neil Gaiman Good Omens
J. K. Rowling, Harry Potter series
William Shakespeare, Hamlet and Macbeth
Tom Stoppard, Travesties
J. R. R. Tolkien, Lord of the Rings
Boris Vian, L'épume des jours
Oscar Wilde, The Importance of Being Earnest and his short stories
P. G. Wodehouse, The inimitable Jeeves (token book, how am I supposed to choose?)
Frances Yates, The Rosicrucian Enlightenment

Oh, my, it really is quite difficult to choose. I'll stop now, I think. I've tried to limit myself to those I really love, which does not always correspond to those I really admire. Love means re-reading. A lot.
Jesus Christ, this is difficult. My books are looking sad because I don't love them.