[Brys]

Gollum gave a good selection there. Pratchett is one of the best comedic authors in fantasy and one of the few authors who almost exclusively write this. Be careful where you start though - some of his earlier novels weren't very good and he has a tendency to draw out a story slightly beyond its natural length. The Colour of Magic, despite being the first book, isn't a good starting place. Try instead perhaps Guards! Guards!, which is hilarious.

Fritz Leiber and de Camp+Pratt are very good humourists as well. Another I would add is Jack Vance's Tales of the Dying Earth. The first book, the Dying Earth, is a collection of quite serious, quite dark short stories. But the next two books are some of the best comedy in fantasy there is - the Eyes of the Overworld and Cugel's Saga.