| Office: | Governor-General of Guadeloupe |
| Term Start: | 1901 |
| Term End: | 1903 |
| Predecessor: | Joseph Pascal François[1] [2] |
| Successor: | Paul Marie Armand de La Loyère |
| Office2: | Governor-General of French West Africa |
| Term Start2: | 1907 |
| Term End2: | 1908 |
| Predecessor2: | Ernest Roume |
| Successor2: | Amédée William Merlaud-Ponty |
| Office3: | Governor-General of French Equatorial Africa |
| Term Start3: | 28 June 1908 |
| Term End3: | 15 May 1917 |
| Predecessor3: | Alfred Albert Martineau |
| Successor3: | Gabriel Louis Angoulvant |
| Office4: | Governor-General of French Madagascar |
| Term Start4: | 24 July 1917 |
| Term End4: | 1 August 1918 |
| Predecessor4: | Hubert Auguste Garbit |
| Successor4: | Abraham Schrameck |
| Office5: | Governor-General of French West Africa |
| Term Start5: | 16 September 1919 |
| Term End5: | 18 March 1923 |
| Predecessor5: | Charles Désiré Auguste Brunet, (acting) |
| Successor5: | Jules Carde |
| Office6: | Governor-General of French Indochina |
| Term Start6: | 9 August 1923 |
| Term End6: | 23 April 1925 |
| Predecessor6: | François Marius Baudouin (acting) |
| Successor6: | Maurice Monguillot |
| Birth Date: | 20 January 1860 |
| Birth Place: | Paris, France |
| Death Place: | Paris, France |
| Occupation: | Colonial administrator |
Martial Henri Merlin (20 January 1860 – 8 May 1935; also Martial Merlin)[3] was a French colonial administrator of the 19th and 20th centuries.[4] He served as the governor-general of Guadeloupe (1901–1903), French West Africa (1907–1908 and 1919—1923), French Equatorial Africa (1908–1917), French Madagascar[5] (1917–1918), and French Indochina[6] [7] (1923–1925).