Changing Places by David Lodge has already been mentioned. I'd like to add Small World and The Writing Game by the same author.
I thought A Year in the Merde by Stephen Clarke was very funny, but maybe you must have lived in France to get the most out of it.
Many of Terry Pratchett's Discworld books are funny, especially the ones about Death, for example Hogfather and Reaper Man.
If you want something more literary, how about The Hippopotamus by Stephen Fry? Or Wilt by Tom Sharpe.
Arto Paasilinna is always good for a laugh, too.