Authors of whose books I've read five, huh. Well this should be embarrassing.
Brian Jacques
Timothy Zahn
Margaret Weis & Tracy Hickman
C.S. Lewis
Harry Harrison
Daniel Pinkwater
Dave Barry
Robert Benchley
Robert Asprin
Robert Jordan
China Miéville
Neal Stephenson
Martha Wells
Tom (shudder) Clancy
If plays count, I've read Shakespeare and Beckett as literature.
I'm probably forgetting one or two because I have a terrible memory.