In military terms, 1st Regiment or 1st Infantry Regiment may refer to:

Australia

1st Regiment, Royal Australian Artillery The 1st Regiment, Royal Australian Artillery is a close support regiment attached to the Australian 7th Brigade, 7th Brigade at Enoggera Barracks in Queensland. The unit was formed in 1914 under the name 1st Australian Field Artillery Brigade, par ...

1st Aviation Regiment (Australia) The 1st Aviation Regiment is one of the Australian Army's three Army Aviation regiments and provides aerial reconnaissance and fire support to the Australian Army. The 1st Aviation Regiment, equipped with Eurocopter Tiger attack helicopters, fo ...

France

1st Marine Infantry Regiment The 1st Marine Infantry Regiment () is a French regiment heir of the colonial infantry. The regiment is one of the regiments of the Troupes de Marine, with the 2nd Marine Infantry Regiment 2e RIMa, the 3rd Marine Infantry Regiment 3e RIMa, as ...

1st Infantry Regiment (France) The 1st Infantry Regiment () or 1er RI is an infantry regiment of the French Army, founded in 1479 as one of the oldest regiments in active service in the world. It is an offspring of the under the ''Ancien Régime'', and one of the five olde ...

Germany

Jäger Regiment 1 (Bundeswehr) Jäger Regiment 1 was an air assault infantry regiment of the German Army. While it comes from the old German tradition of '' Jäger'', it was a relatively recently formed air assault formation, established in 2006. The regiment was part of Airmo ...

1st Foot Guards (German Empire) The 1st Foot Guard Regiment or 1st Guards Regiment of Foot () was an infantry regiment of the Royal Prussian Army formed in 1806 after Napoleon defeated Prussia in the Battle of Jena–Auerstedt. It was formed by combining all previous Foot Gu ...

1st (Emperor Alexander) Guards Grenadiers The 1st (Emperor Alexander) Guards Grenadiers (, briefly ''Alexander-Regiment'' or ''Alexandriner'') were an infantry regiment of the Guard Corps within the Royal Prussian Army and a Guards Grenadiers regiment of the Imperial German Army. Histo ...

* 1st (1st East Prussian) Grenadiers "Crown Prince" *

SS Fortress Regiment 1 SS Fortress Regiment 1 () was an improvised unit of the Waffen SS formed in February 1945, during World War II, for service in the defence of the German city of Breslau, during the Red Army's Siege of Breslau. The regiment engaged in savage ...

Greece

1st Infantry Regiment (Greece) The 1st Infantry Regiment "Sangarios" () is a motorized infantry regiment of the Hellenic Army. Established in 1885 at Athens, it fought in all conflicts in which Greece participated until World War II, when it was disbanded following the German i ...

* 1st Evzone Regiment * 1st Raider Regiment (Greece), see 3rd Special Forces Division *

1st Serres Regiment First most commonly refers to: * First, the ordinal form of the number 1 First or 1st may also refer to: Acronyms * Faint Images of the Radio Sky at Twenty-Centimeters, an astronomical survey carried out by the Very Large Array * Far Infrared a ...

Poland

* 1st Aviation Regiment (Poland)

Spain

* 1st King's Immemorial Infantry Regiment

South Africa

Durban Light Infantry The Durban Light Infantry is a Motorised Infantry regiment of the South African Army. It lost its status as a Mechanised infantry regiment in 2010 in line with the rationalisation of resources. As a reserve unit, it has a status roughly equival ...

, formerly 1st Infantry (Durban Light Infantry)

Thailand

* 1st Infantry Regiment, King's Own Bodyguards

United Kingdom

1st (Royal) Regiment of Foot The Royal Scots (The Royal Regiment), once known as the Royal Regiment of Foot, was the oldest and most senior infantry regiment line infantry, of the line of the British Army, having been raised in 1633 during the reign of Charles I of England ...

1st Regiment of Foot Guards The Grenadier Guards (GREN GDS) is the most senior infantry regiment of the British Army, being at the top of the Infantry Order of Precedence. It can trace its lineage back to 1656 when Lord Wentworth's Regiment was raised in Bruges to protect ...

* 1st Regiment Greek Light Infantry * 1 Regiment RLC, a unit of the Royal Logistic Corps *

1 Regiment Army Air Corps 1 Regiment Army Air Corps is a regiment of the Army Air Corps (AAC). History * Detmold , 9, 17 & 26 Flights , 1964-1969 * Detmold , 651, 657 & 658 Squadrons , 1969-1971 * HQ at Detmold , 651 at Verden, 657 at Soltau & 658 Squadron at Min ...

United States

1st Infantry Regiment (United States) The 1st Infantry Regiment is a regiment of the United States Army that draws its lineage from a line of post American Revolutionary War units and is decorated with thirty-nine campaign streamers. The 1st Battalion, 1st Infantry is assigned as ...

1st Marine Regiment (United States) The 1st Marine Regiment is an infantry regiment of the United States Marine Corps based at Marine Corps Base Camp Pendleton, California. The regiment is under the command of the 1st Marine Division and the I Marine Expeditionary Force. The 1st ...

* 1st Massachusetts Infantry Regiment, a unit in the American Civil War *

1st Aviation Regiment (United States) The 1st Aviation Regiment is a task force and is a unit in the Combat Aviation Brigade, 1st Infantry Division (United States), First Infantry Division's Combat Aviation Brigade, composed of three battalion units of pilots, crews, and teams within ...

Yugoslavia

1st Fighter Regiment The 32nd Aviation Division (''Serbo-Croatian language, Serbo-Croatian: 32. vazduhoplovna divizija/ 32. ваздухопловна дивизија'') was a Yugoslavian military air unit originally established in 1945 as the 4th Aviation Bomber ...

* 1st Yugoslav Fighter Regiment *

1st Transport Aviation Regiment First most commonly refers to: * First, the ordinal form of the number 1 First or 1st may also refer to: Acronyms * Faint Images of the Radio Sky at Twenty-Centimeters, an astronomical survey carried out by the Very Large Array * Far Infrared a ...

1st Training Aviation Regiment First most commonly refers to: * First, the ordinal form of the number 1 First or 1st may also refer to: Acronyms * Faint Images of the Radio Sky at Twenty-Centimeters, an astronomical survey carried out by the Very Large Array * Far Infrared a ...

* 1st Air Reconnaissance Regiment