The name for [[mecha]] in [[Code Geass]]. Knightmare Frames are humanoid weapons originally developed by the Holy Brittanian Army and first used during the invasion of Japan. 

There also exist large non-humanoid mecha that are classified as [b]Knight Giga Fortress[/b], similar to the [[mobile armor]]s of the [[Gundam]] series.
ナイトメアフレーム KMF