Robot Masters was a Japanese exclusive sub-line of Transformers toys which ran between 2004-2005 consisting mainly of redecoes of previously-released toys with several all-new molds of popular characters thrown into the mix.

• RM-01 - G1 Convoy
• RM-02 - Beast Megatron
• RM-03 - Rijie
• RM-04 - Wrecker Hook
• RM-05 - R-Blade
• RM-06 - Air Hunter
• RM-07 - Bound Rogue
• RM-08 - Wingstun
• RM-09 - Psycho-Orb
• RM-10 - G1 Convoy (metallic version) + DVD
• RM-11 - Beast Convoy
• RM-12 - G1 Starscream
• RM-13 - Smoke Sniper
• RM-14 - Gigant Bomb
• RM-15 - Star Saber
• RM-16 - Victory Leo
• RM-17 - Victory Saber
• RM-18 - Road Rocket
• RM-19 - Double Face
• RM-20 - Delta Seeker vs. X-Gunner
• RM-21 - Burning Beast Convoy + DVD
• RM-22 - Lio Convoy
• RM-23 - Lio Convoy (metallic version) + DVD
• RM-24 - Reverse Convoy
• Robot Masters Edition Skywarp & Thundercracker