There are 9 books in the Calvin and Hobbes series. The newest book is Homicidal Psycho Jungle Cat which came out in 1994.

1
The Essential Calvin and Hobbes

Book cover of The Essential Calvin and Hobbes
The award-winning cartoonist details the further adventures of Calvin, a mischievous young boy with boundless energy and imagination, and his lovable stuffed tiger.
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2
The Authoritative Calvin and Hobbes

Book cover of The Authoritative Calvin and Hobbes

Calvin, cheeky, hyperactive and mischievous, and Hobbes, his cuddly toy tiger who, as far as Calvin is concerned is very much alive and kicking, are two of the most loveable and hilarious characters to grace the comic strip in years.

This collection contains Yukon Ho! and Weirdos from Another Planet…

3
The Indispensable Calvin and Hobbes

Book cover of The Indispensable Calvin and Hobbes
This omnibus edition includes Revenge of the Baby-Sat and Scientific Progress Goes Boink as well as other cartoons, integrated throughout. Bill Watterson won the 1986 Reuben Award as Outstanding Cartoonist of the Year, nominated by the National Cartoonists' Society.

4
Attack of the Deranged Mutant Killer Monster Snow Goons

Book cover of Attack of the Deranged Mutant Killer Monster Snow Goons
Calvin and Hobbes are back in another thrilling adventure involving escapes from girls, parents, and snow goon monsters.

In Attack of the Deranged Mutant Killer Monster Snow Goons, Calvin suffers a host of hardships. He gets attacked by his new two-wheeler bike. Hobbes gets kidnapped by Susie, a slimy girl.…

5
Revenge of the Baby-Sat

Book cover of Revenge of the Baby-Sat
"Calvin and Hobbes provided an exhilarating blend of fantasy, sophistication, pungent humor and superb drawing that was dazzling." —The Plain Dealer, Cleveland, Ohio

With keen insight, Bill Watterson depicted life through the eyes of a child in Calvin and Hobbes—with all the inherent fun and frustrations. Through the adventures of…

6
Scientific Progress Goes "Boink"

Book cover of Scientific Progress Goes "Boink"
Calvin and Hobbes touched the hearts (and funny bones) of the millions who read the award-winning strip. One look at this Calvin and Hobbes collection and it is immediately evident that Bill Watterson's imagination, wit, and sense of adventure are unmatched.

In this collection, Calvin and his tiger-striped sidekick Hobbes…

7
There's Treasure Everywhere

Book cover of There's Treasure Everywhere
Whether Calvin and Hobbes are blasting off on another interplanetary adventure or approaching warp speed on a downhill wagon ride, their capers consistently charm and refresh their readers' days.

In the world that Calvin and his tiger Hobbes share, treasures can be found in the most unlikely places, from the…

8
The Days are Just Packed

Book cover of The Days are Just Packed
Zounds! Spaceman Spiff, Stupendous Man, the ferocious tiger Hobbes, and the rest of Calvin's riotous imagination are all included in The Days Are Just Packed.

Calvin, the self-proclaimed "Boy of Destiny," continues to save the universe with his alter egos, Spaceman Spiff and Stupendous Man, at least until Miss Wormwood…

9
Homicidal Psycho Jungle Cat

Book cover of Homicidal Psycho Jungle Cat
Calvin and Hobbes are at it again, and this time, our irrepressible friends are taking a walk on the wild side.

Homicidal Psycho Jungle Cat chronicles another segment of the multifarious adventures of this wild child and his faithful, but skeptical, friend. If the best cartoons compel readers to identify…