Battle droid/Legends

A battle droid (also referred to as war droid or killer droid) was any droid designed for combat.

There were numerous types of battle droids. They predated the Galactic Republic by thousands of years, with the earliest known being Rakatan ancient droids and the war-robots used by Xim the Despot.

Many of the best known battle droids were those used by the Confederacy of Independent Systems during the Clone Wars.

By the time of the Battle of Yavin, however, battle droids were extremely rare, most likely due to the Clone Wars, or because the Empire didn't want an army that could be easily built and used against it.

Infinite Empire

 * Ancient droid

Xim the Despot's empire

 * War-Robot

First Sith Empire

 * Sith Elite Warbot
 * Sith Sentry
 * Sith Slayer Droid

Krath

 * Krath war droid

Mandalorians

 * Basilisk war droid

Galactic Republic

 * War droid-series
 * Assault droid Mark I
 * Assault droid Mark II
 * Assault droid Mark IV
 * L8-L9 combat droid
 * SD-6 Hulk infantry droid
 * War droid-series

Sith Empire

 * War droid-series
 * Assault droid Mark I
 * Assault droid Mark II
 * Assault droid Mark IV

Confederacy of Independent Systems

 * Hunter-killer droid
 * Baron battle droid
 * A-series assassin droid
 * Advanced dwarf spider droid
 * Air battle droid
 * B1 battle droid
 * B2 super battle droid
 * B3 ultra battle droid
 * Battle droid assassin
 * BL-series Battle Legionnaire
 * Buzz droid
 * Corporate Alliance Artillery Regular
 * Corporate Alliance Energy Pummel
 * D-60 assault droid
 * D-90 assault droid
 * Droid commando
 * Light droid starfighter
 * Droid tri-fighter
 * Droideka
 * E-STAP Advanced Droid Starbomber
 * E-STAP Droid Starbomber
 * E-STAP Shielded Droid Starbomber
 * Dwarf spider droid
 * Grapple droid
 * Ground Armored Tank
 * Heavy Assault droid
 * Heavy Corporate Alliance Energy Pummel
 * Heavy dwarf spider droid
 * Heavy Missile Platform
 * IG-series battle droid
 * IG-100 MagnaGuard
 * IG-226 Hailfire-class droid tank
 * IG-227 Hailfire-class droid tank
 * JK-13 security droid
 * LM-432 crab droid
 * Manta-class droid subfighter
 * NR-N99 Persuader-class droid enforcer
 * Octuptarra droid
 * OG-9 Homing spider droid
 * Ohma-D'un super battle droid
 * Protodeka
 * Scarab-class droid starfighter
 * Spelunker probe droid
 * Tri-droid
 * Turret droid
 * Variable Geometry Self-Propelled Battle Droid, Mark I
 * Variable Geometry Self-Propelled Battle Droid, Mark II
 * Necrosis

Chirq Council

 * Chirq Mechanized Guardian

IG-88's Droid Army

 * Tao-Ni Security Elite Protector

Zann Consortium

 * Droideka Mark II

Galactic Empire/Imperial Remnant

 * AP-3 attack droid
 * AP-2 attack droid
 * AP-1-C attack droid
 * BT-16 perimeter defense droid
 * IG-97
 * Fromm Tower Droid
 * Dark Trooper Series
 * SD Series Droids
 * Shadow droid
 * TIE/D fighter
 * Viper Hunter-Killer
 * Viper Probe Droid
 * XR-85 Tank Droid
 * Z-X3
 * ZQ infantry droid
 * Necrosis

Ssi-Ruuk

 * Security Droid
 * Swarm-class battle droid

New Republic/Galactic Federation of Free Alliances

 * Foreign Intruder Defense Organism
 * X-1 Viper
 * YVH 1 Yuuzhan Vong Hunter 1
 * YVH 2 Yuuzhan Vong Hunter 2
 * YVH-M Yuuzhan Vong Hunter mouse droid
 * YVH 5-S Bugcruncher war droid
 * SWAT-droid

Appearances

 * Star Wars: Galactic Battlegrounds
 * Star Wars: The Rise and Fall of Darth Vader
 * Darth Maul: Saboteur
 * Darth Maul: Shadow Hunter
 * Cloak of Deception
 * Star Wars: Starfighter
 * Star Wars Episode I: The Phantom Menace novel
 * Star Wars Episode I: The Phantom Menace
 * Star Wars Episode I: The Phantom Menace game
 * Star Wars Episode I: The Phantom Menace junior novel
 * Star Wars: Battlefront
 * Republic Commando: Triple Zero
 * Star Wars: Republic Commando
 * Rogue Planet
 * Jedi Quest: The Way of the Apprentice
 * Outbound Flight
 * Jedi Quest: The School of Fear
 * The Approaching Storm
 * Star Wars: Jedi Starfighter
 * Star Wars Episode II: Attack of the Clones
 * Star Wars Episode II: Attack of the Clones junior novel
 * Star Wars: The Clone Wars video game
 * Star Wars: Battlefront II
 * Star Wars: Galactic Battlegrounds: Clone Campaigns
 * Republic Commando: Hard Contact
 * "Odds"
 * MedStar I: Battle Surgeons
 * MedStar II: Jedi Healer
 * Yoda: Dark Rendezvous
 * Star Wars Episode III: Revenge of the Sith
 * Star Wars Episode III: Revenge of the Sith game
 * Star Wars Episode III: Revenge of the Sith junior novel
 * Coruscant Nights I: Jedi Twilight
 * The Last of the Jedi: A Tangled Web
 * The Last of the Jedi: Return of the Dark Side
 * The Last of the Jedi: Secret Weapon
 * Star Wars: Droids Special
 * Han Solo and the Lost Legacy
 * Star Wars: Dark Forces
 * Star Wars: Demolition
 * Star Wars: Empire at War: Forces of Corruption
 * Star Wars: Rogue Squadron III: Rebel Strike
 * The Truce at Bakura
 * Dark Empire
 * Dark Empire II
 * Star Wars: Jedi Knight: Jedi Academy
 * Star Wars: Chewbacca
 * Star by Star
 * Destiny's Way
 * Living Force Campaign Guide
 * Star Wars: Droids (Marvel)

Non-canon Appearances

 * LEGO Star Wars: The Video Game
 * LEGO Star Wars: The Complete Saga
 * "Kowakian Monkey-Lizzard"
 * "Giant spiders are awesome"
 * "Always count your clones before take-off"