| PICIRILLI (R.E.) | Postal and Airmail Rates in France & Colonies 1920-1945 [2011] | Aviation, France |
| PIENDL (Max) | Thurn und Taxis 1517-1867: zur geschichte des furstlichon hauses und der Thurn und Taxisschenpost [1967] | N/A |
| PIERCE (Arthur D) | St Vincent. The postal history 1762-1965: the postage stamps 1861-1897; The cancellations & handstamps 1861-1915, the revenue stamps 1852-1897 [1971] | N/A |
| PIET (Jukka-Pekka) | A history of the Finnish posts 1638-1988 | N/A |
| PIETIAINEN (Jukka-Pekka) | A history of the Finnish posts 1638-1988 [1988] | N/A |
| PILKINGTON (Colin) | The postal tariffs of the Italian Area 1850-1985 [1985] | N/A |
| PILKINGTON (Colin) | The Italian post offices in Constantinople 1908-1923 | N/A |
| PIPE (W T) | Postmarks of British railway stations [1994] | Railways |
| PIPE (W T) | Postmarks of British and Irish railway stations 1840-1997 [2002] | Railways |
| PIRIE (J H Harvey) | Stamps & postal history of Swaziland and of the New Republic [1955] | N/A |
| PIRIE (J H Harvey) | Antarctic posts & stamps [1948] | N/A |
| Pizer R. | German Occupation of Belgium and North Eastern France 1914-1918 (2019) | Belgium, France, Military, WW1 |
| POLISH PHILATELIC SOCIETY | Polish postal rates to 1966 [1967] | N/A |
| POND (CC) | The House of Commons Post Office [1993] | Official |
| POPE (M) | The story of decipherment from Ehyptian hieroglyphic to linear B [1975] | N/A |
| PORIGNON (J-C) | La poste rurale au XIXeme siecle en Belgique (dictionnaire/catalogue) et en Europe (apercu) [1993] | Belgium |
| POST OFFICE | Green Papers No 1 to No 47 [1933-1939] | N/A |
| POST OFFICE | Postal Directory [1987] | N/A |
| POST OFFICE | Post Office Guides 1857 (facsimile), 1857-1913, 1931-2, 1938, 1945, 1953-56, 1964, 1966, 1969, 1971-74, 1976-77, 1982, 1986 | N/A |
| POST OFFICE | Vacancies or appointments 1737-1957 : a listing by rank & catalogue of Post Class 58 [1990] | N/A |
| POST OFFICE | Headship of the Post Office from 1635 | N/A |
| POST OFFICE | Letter Post: postage rates from 1635; Parcel Post from 1883 | N/A |
| POST OFFICE | Headquarters of the Post Office from c 1516 | N/A |
| POST OFFICE | The Mail Coach Service 1784-1846 | N/A |
| POST OFFICE | Development of Road Transport | N/A |
| POST OFFICE | Postal uniforms from 1784 | N/A |
| POST OFFICE | Early Post Offices | N/A |
| POST OFFICE | Cats on the payroll | N/A |
| POST OFFICE | Edward VIII pillar boxes [1969] | N/A |
| POST OFFICE | Victorian Pillar Boxes [1969] | N/A |
| POST OFFICE | Pillar Boxes 1852-1946 | N/A |
| POST OFFICE | Index to minuted papers 4 vols Vol. 1 – 1886-1969; Vol. 2 1883-1973; Vol 3 1913-1969; Vol. 4 1839-1973 | N/A |
| POST OFFICE | Handstruck stamps: proof books etc 1823-1929 – a catalogue of post class 55 [1990] | N/A |
| POST OFFICE | Emergency war services: a catalogue of Post Class 56 – 1859-1950 [1990] | Military |
| POST OFFICE | TPO: the story of the travelling post office [1988] | Railways |
| POST OFFICE | Scottish Post Bus Guide 1991-2 | N/A |
| POST OFFICE | Post Bus Guide 1989 | N/A |
| POST OFFICE | Account of the celebration of the Jubilee of Uniform Inland Penny Postage 1840-1890 [1891] | Great Britain |
| POST OFFICE | Speed, regularity and security: in celebration of the Royal Mail [1984] | Great Britain |
| POST OFFICE | Rules for sub-postmasters in the United Kingdom [1856] | Great Britain |
| POST OFFICE | Rules for postmasters in Scotland [1856] | N/A |
| POST OFFICE | Rules for postmasters in Ireland [1856] | N/A |
| POST OFFICE | Rules for postmasters in England & Wales [1856] | N/A |
| POST OFFICE | Post offices in the United Kingdom (excluding the London postal area) and the Irish Republic [1960, 1973, 1974, 1976] | N/A |
| POST OFFICE | Postal addresses & index to postcode directories [1976, 1983, 1987] | N/A |
| POST OFFICE | The (Edinburgh) Post Office Annual Directory for 1830-31 [1830] | N/A |
| POST OFFICE | The Post Office: an historical summary [1911] | N/A |
| POST OFFICE | London Post Offices and Streets [1972] | N/A |
| POST OFFICE | London post Offices [1926] | N/A |
| POST OFFICE | List of principal streets in London showing in each case the initials of the postal district & the number of the Office of delivery [1917 & 1924] | N/A |