P
- Pakistan (1947–)
- Palau (1983–)
- Palestine (1918–1942)
- Palestinian Authority (1994–)
- Panama (1878–)
- Papua New Guinea (1901–)
- Paraguay (1870–)
- Penrhyn Island (1902–1928, 1973–)
- Peru (1857–)
- The Philippines (1854–)
- Pitcairn Islands (1940–)
- Poland (1860, 1918–)
- Polish post offices in the Turkish Empire (1919)
- Poland Exile Government (1941–1944)
- Ponta Delgada (1892–1905)
- Portugal (1853–)
- Azores (1980–)
- Madeira (1980–)
- Portuguese Africa (1898–1919)
- Portuguese Congo (1894–1914)
- Portuguese Guinea (1881–1973)
- Portuguese India (1871–1960)
- Puerto Rico (1873–1900)
- Puntland
Read more about this topic: List Of People On Stamps