General Noël Marie Amédée Garnier-Duplessix or Duplessis (25 December 1860 – 2 March 1928) was a French army officer.

Whilst still a colonel he commanded the 2nd Infantry Division in the Allied victory at the First Battle of the Marne before seeing service in the Zaian War in the French protectorate of Morocco.

He received command of the 9th Army Corps in June 1918 and led that unit to victory in the August Battle of Amiens and the autumn Meuse-Argonne Offensive.

He transferred to the staff of General Hubert Lyautey on 23 September 1913 to take command of units in Eastern Morocco.

[5] This was whilst the division was engaged in the important First Battle of the Marne that thwarted the German Schlieffen Plan objective of quickly capturing Paris.

[6] After the French defeat at the Battle of El Herri left Khénifra threatened with capture, Garnier-Duplessix led his groupe mobile 30 miles (48 km) through continuous Berber ambushes to relieve the strategically important town within three days.

[8][9] The division participated in the assault of 15 December 1916 when the Germans were pushed back 3 miles (4.8 km) and the French captured 11,000 prisoners (including 300 officers), 115 artillery pieces, hundreds of machine guns and many supply depots.

[8] Garnier-Duplessix later led the 37th Division in the Nivelle Offensive of April 1917 where his troops included the 5th Regiment of the Russian Expeditionary Force in France.

[14] He was appointed adjutant general and was responsible for co-ordinating three divisions of infantry, seven batteries of artillery, a cavalry regiment and two squadrons of aircraft.

[15] Garnier-Duplessix replied with a note stating that it was impossible to evacuate the province within the requested timespan of one month due to the difficulty in establishing a sufficient police force in that period to maintain order and prevent reprisals, particularly against Christians.