1st Regiment

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

Australia

 * 1st Regiment, Royal Australian Artillery
 * 1st Aviation Regiment (Australia)

France

 * 1st Marine Infantry Regiment
 * 1st Infantry Regiment (France)

Germany

 * Jäger Regiment 1 (Bundeswehr)
 * 1st Foot Guards (German Empire)
 * 1st (Emperor Alexander) Guards Grenadiers
 * 1st (1st East Prussian) Grenadiers "Crown Prince"
 * SS Fortress Regiment 1

Greece

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

Poland

 * 1st Aviation Regiment (Poland)

Spain

 * 1st King's Immemorial Infantry Regiment

South Africa

 * Durban Light Infantry, formerly 1st Infantry (Durban Light Infantry)

Thailand

 * 1st Infantry Regiment, King's Own Bodyguards

United Kingdom

 * 1st (Royal) Regiment of Foot
 * 1st Regiment of Foot Guards
 * 1st Regiment Greek Light Infantry
 * 1 Regiment RLC, a unit of the Royal Logistic Corps
 * 1 Regiment Army Air Corps

United States

 * 1st Infantry Regiment (United States)
 * 1st Marine Regiment (United States)
 * First Regiment Massachusetts Volunteer Infantry, a unit in the American Civil War
 * 1st Aviation Regiment (United States)

Yugoslavia

 * 1st Fighter Regiment
 * 1st Yugoslav Fighter Regiment
 * 1st Transport Aviation Regiment
 * 1st Training Aviation Regiment
 * 1st Air Reconnaissance Regiment