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*[[Lord Commander of the Imperium]] is the highest known military rank within the Imperial hierarchy, second only to the [[Emperor]] himself.{{Fn|6}} ;See Also*[[Imperial Regent]]

Occasionally referenced as Lord Militant Commander and also referred to as *a [[Lord High Admiral]]{{Fn|11}}, a '''Lord Commander of the [[Imperial Navy]]''' , has jurisdiction over the Imperial Navy in a [[Segmentum]] of the Imperium.{{Fn|7}} Of these, the Lord Commander of the Segmentum Solar is the foremost, and is often appointed to a position on the [[High Lords of Terra]].{{Fn|7}}{{Fn|9}} ;Notable Lord Commanders of the Imperial Navy*[[Jaxon]] ([[Segmentum Solar]]}*[[Drang]] ([[Segmentum Obscurus]]){{cite this}}*[[Hal Orpheus]] ([[Segmentum Tempestus]])

{{IGHierarchy}}===*a [[Lord Commander (Imperial Guard)|Lord Commander===A ]] a strategic rank of the [[Imperial Guard]] subordinate only to the [[Lord Commander Militant]], the five '''Lord Commanders of the Imperial Guard''' are each responsible for the Guard forces in each of the Imperium's [[segmentum]]s.{{Fn|10}} ;Notable Lord Commanders of the Imperial Guard*[[Macharius (Character)|Macharius]], [[Lord Commander Solar]]*[[Arcadian Leontus]], [[Lord Commander Solar]]*[[Phillips]], [[Lord Commander Solar]]*[[Lucellin Tyberius]]*[[Morcar]] - fought with the [[Eldar]]. See also [[Quotes Astra Militarum#M|His Quote]]{{Fn|15}}*[[Otto Ivan Gustavus]]*[[Von Klimt]]*[[Sebiascor Ebongrave]]*[[Tchepikov]]{{Fn|21}}*[[Ustrin]] - led a [[Victorium Crusade]]{{Fn|20}}*[[Zuehlke]] ===Lord Commander of the Expedition Fleet===During the [[Great Crusade]], a '''Lord Commander of the Expedition Fleet''' was a position in the [[Imperial Army]], during the highest of its kind. A Lord Commander was in charge of an entire [[Expedition Fleet]], unless a Primarch was attached to it; in which case the Primarch took precedence and the Lord Commander was chiefly in charge of the soldiers of the Imperial Army.{{Fn|3}}{{Fn|5}} ;Notable Lord Commanders of the Expedition Fleet*[[Hektor Varvarus]] ([[63rd Expedition Fleet]])*[[Thaddeus Fayle]] ([[28th Expedition Fleet]])*[[Teng Namatjira]] ([[680th Expedition Fleet]])Great Crusade

*a [[Legion Master]], sometimes named '''''Lord Commander''''' was a title indicating the command of a [[Legion]], before the [[Primarch]]s were rediscovered. Some bore the title of [[Legion Master]]s instead.{{Fn|12}}*a [[Lord Commander (Legiones Astartes)|Lord Commander]] became the title given to the [[Praetor (Rank)|Praetors]] in charge of a [[Space_Marine_Legion#Strategic_Disposition_of_a_Space_Marine_Legion|Chapter]] during the [[Great Crusade]].{{Fn|14}}*In [[M41]], at least one Space Marine Chapter, the [[Silver Skulls]], styles its [[Chapter Master]] as '''Lord Commander'''. The current holder of the title is [[Argentius]].{{Fn|19}}

;Knights of Taranis*The [[Knights of Taranis]], a [[Knight House]] on [[Mars]], was ruled by joint commanders each known as a '''Lord Commander''' of the Knights of Taranis.{{Fn|8}}