Completed Series, Trilogies Duologies

Duologie

The Sight, David Clement Davies
If I Stay, Gayle Forman
The Shinning, Stephen King
Daughter of the Lioness, Tamora Pierce

Trilogy

As Dead As It Gets, Katie Alender
Inkworld, Cornelia Funk
Beka Cooper : The Hunt Records, Tamora Pierce

Complete Series

The Books of Pellinor (4 books)
Uglies, Scott Westerfeld (4 books)
Hannibal Lecter, Thomas Harris (4 books)
IceMark Chronicles, Stuart Hill (4 books)
Warriors, Erin Hunter (6 books)
The Beast House Chronicles, Richard Laymon (4 books)
Twilight, Stephenie Meyer (4 books)
The Circle Opens, Tamora Pierce (4 books)
Song of the Lioness Tamora Pierce (4 books)
Protector of the Small, Tamora Pierce (4 books)
Immortals, Tamora Pierce (4 books)
Circle of Magic, Tamora Pierce (4 books)
Percy Jackson and the Olympians, Rick Riordan (5 books)
Harry Potter, JK Rowling (7 books)
Series of Unfortunate Events, Lemony Snicket (13 books)
The Nightside, Simon R Green (12 books)
Redwall, Brain Jaques (22 books)