My 'most read' authors according to Goodreads...

The Guns of the South - Harry Turtledove Carry on, Jeeves - P.G. Wodehouse A Meeting at Corvallis - S.M. Stirling North and South - John Jakes Little House on the Prairie - Laura Ingalls Wilder, Garth Williams Hood - Stephen R. Lawhead Hexed - Kevin Hearne Outlander - Diana Gabaldon Anne of Green Gables - Jennifer Lee Carrell, L.M. Montgomery Good Omens: The Nice and Accurate Prophecies of Agnes Nutter, Witch - Terry Pratchett, Neil Gaiman

Idea stolen from -  Char's Horror Corner

 

Not exactly sure how they figured this, but probably because I do not keep accurate records at Goodreads.  I know, for example, I have read far more books by Lois McMaster Bujold than Stephanie Meyers.

 

Anyway, here are top 20 from Goodreads (had to go to 20 because 15 is just not a 'good' number... OCD and all):

 

1

Harry Turtledove

2

P.G. Wodehouse

3

S.M. Stirling

4

John Jakes

5

Laura Ingalls Wilder

6

Stephen R. Lawhead

7

Kevin Hearne

8

Diana Gabaldon

9

Stephenie Meyer

10

L.M. Montgomery

11

Terry Pratchett

12

J.K. Rowling

13

Lois McMaster Bujold

14

Frank Herbert

15

George R.R. Martin

16

Naomi Novik

17

Edward Rutherfurd

18

Jean M. Auel

19

Alexander McCall Smith

20

Tom Clancy