M
- Macao (1884–)
- Republic of Macedonia (1992–)
- Madagascar (1884–)
- Madeira (1868–1928)
- Malawi (1964–)
- Malaya
- Malaya, Federated States (1900–1951)
- Malaya, Federation (1957–1964)
- Johore (1876–1960)
- Kedah (1912–1959)
- Kelantan (1911–1962)
- Malacca (1948–1960)
- Negri Sembilan (1891–1961)
- Pahang (1889–1957)
- Penang (1948–1960)
- Perak (1878–1957)
- Perlis (1948–1957)
- Selangor (1881–1961)
- Sungei Ujong (1881–1895)
- Trengganu (1909–1957)
- Malaysia (1963–)
- Malaysia Johore (1965–1986)
- Malaysia Kedah (1965–1986)
- Malaysia Kelantan (1965–1986)
- Malaysia Malacca (1965–1986)
- Malaysia Negri Sembilan (1965–1986)
- Malaysia Pahang (1965–1986)
- Malaysia Penang (1965–1986)
- Malaysia Perak (1965–1986)
- Malaysia Perlis (1965–1986)
- Malaysia Sabah (1964–1965)
- Malaysia Sarawak (1964–1965)
- Malaysia Selangor (1965–1986)
- Malaysia Trengganu (1965–1986)
- Malaysia Wilayah Persekutuan (1986)
- Maldives (1906–)
- Mali (1959–)
- Malta (1860–)
- Manchukuo (1932–1945)
- Marienwerder (1920-1920)
- Marshall Islands (1897–1916, 1984–)
- Martinique (1886–1947)
- Mauritania (1906–)
- Mauritius (1847–)
- Mayotte (1892–1912, 1997–)
- Memel (1920–1922)
- Mesopotamia (1917–1922)
- Mexico (1856–)
- Campeche (1876)
- Chiapas (1866)
- Chihuahua (1872)
- Cuautla (1867)
- Cuernavaca (1867)
- Guadalajara (1867–1868)
- Merida (1916)
- Sinaloa (1929)
- Tlacotalpan (1856)
- Yucatan (1924)
- Federated States of Micronesia (1984–)
- Middle Congo (1907–1933)
- Moldova (1991–)
- Monaco (1885–)
- Mongolia (1924–)
- Montenegro (1874–1913)
- Montserrat (1876–)
- Morocco (1956–)
- Mozambique (1877–)
- Mozambique Company (1892–1941)
- Myanmar (1990–)
Read more about this topic: List Of People On Stamps