This is a list of Kamen Rider Decade episodes. Following the first episode, every two episodes have taken place in an alternate dimension. The first nineteen episodes feature storylines based on the Heisei Kamen Rider Series. The latter half of the series features two story arcs that are original stories, a story arc serving as a crossover with Samurai Sentai Shinkenger, and two story arcs based on the Shōwa Kamen Rider Series. In addition to the 31 episodes, the story of Decade is also told in the films Kamen Rider Decade: All Riders vs. Dai-Shocker and Kamen Rider × Kamen Rider W & Decade: Movie War 2010. On October 4, 2009, TV Asahi began a re-broadcast of the series from beginning to end at 6:30 am timeslot. When episodes 30 and 31 were rebroadcast on May 2 and 9, 2010, respectively, they were recut with some scenes extended and others cut, labeled as "Special Edition" (特別編) versions.

Episodes

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Rider War

The World of Kuuga

Transcendence

Second Movement ♬ Prince Kiva

The Biting King's Qualifications

Battle Trial: Ryuki World

Super Trick of the Real Criminal

Welcome to Blade Cafeteria

Blade Blade

Faiz High School's Phantom Thief

555 Faces, 1 Treasure

Reunion: Project Agito

Awakening: Tornado of Souls

Cho-Den-O Beginning

Here Comes Super Momotaros!

Warning: Kabuto Running Amok

The Grandma Way of Taste

Idle Hibiki

Ending Journey

The World of Negatives' Dark Riders

The Walking All-Rider Album

Wanted: Diend

End of Diend

The Arrival of the Samurai Sentai

Heretic Rider, Go Forth!

RX! Dai-Shocker Attack

Black × Black RX

Amazon, Friend

The Strong, Naked, Strong Guy

Rider War: Prologue

The Destroyer of Worlds