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The term "Knights of Terra" refers to multiple distinct fictional groups across different universes, with no single canonical entity.

In the Warhammer 40,000 universe, there is no official chapter named the "Knights of Terra." However, the concept of Imperial Knights—humanoid war machines piloted by noble knights—exists, and there are discussions on fan forums about their potential presence on Terra, the Imperial capital. Some fan-created lore suggests a chapter called the "Knights of Terra," described as a Space Marine chapter with grey, silver, maroon, and black colours, serving the Emperor and originating from an unknown homeworld, possibly linked to the Ultramarines. This is a fan-made creation and not part of official Warhammer 40,000 lore.

In the fan-made Mobile Suit Gundam XC universe, the Knights of Terra (地球騎士団, Tera no Kishi-dan) are a paramilitary organization formed during the Earth Union era to protect the Terran Party. They now serve as political officers and counter-insurgency forces for the Empire of Terra, composed of noble-born political officers who enforce a Terranist ideological narrative within the Imperial Terran Armed Forces and among citizens.

Another fan-created entity, the Knights of Terra from the fan-made game "The Reincarnation," are a group of ancient, resurrected mages who pledged eternal fealty to a powerful mage named Apollo to protect the world of Terra from destruction by dark forces and the gods. They are known as forbidden warriors, bound by a pledge to return from the grave to fight against evil.

Additionally, in a fan-made setting called Eternal Requiem, the Knights of Terra are an order of Force-sensitive former Jedi who serve the Monarchs of the Terran Imperium, protecting the royal family and viewing the Force as an ally rather than a tool.

Lastly, a real-world artist named Terra created a unique Imperial Knight army called "The Pride of Terra," featuring queer and gender non-conforming knights who display their gender and sexual identity on their armor, using flags as part of their design and backstory to promote inclusivity and awareness. This is a personal artistic project and not a fictional organization.