Marcel Alix Jean Marchessou (24 June 1879 – 6 April 1964) was a French colonial administrator, spending over 30 years in Africa.

He was Acting Governor-General of French Equatorial Africa again in September–October 1934, and again between March 1935 and April 1936.

In December 1936 he moved to New Caledonia to start a two-year term as Governor of New Caledonia, Commissioner General in the Pacific and High Commissioner to the New Hebrides.

During his time in the Pacific he gained the nickname "Marche dessous" (walk underneath) due to his height of only 5'.

[2] Following World War II he was excluded from the Legion of Honour for his alleged role in court-martialing members of the French resistance in Riom during the Vichy regime.