| WINGENT (P) | Imperial Airways Empire Flying Boat Services 1936 to 1939 [1997] | Aviation |
| WINGENT (P) | Imperial Airways Empire Flying Boat Services 1936 to 1939 [1997] | Aviation |
| WINGENT (P) | Movements of aircraft on Imperial Airways African Route 1931-39 [1991] | Aviation |
| WINKLER (J J) | Handbuch der Schweizer voorphilatelie 1695-1850 [1968] | N/A |
| WINTER (R F ) | Understanding Transatlantic Mail Vol II | Maritime |
| WINTER (Richard F) | US – Spain Mails via British Convention 1849-1876 [1990] | Maritime |
| WINTER (Richard F) | North Atlantic mail sailings 1840-75: edited by Susan M McDonald | N/A |
| WISEMAN (W.A.) | Great Britain: The De La Rue Years 1878-1910 Vol. 1 [1984]; Vol. 2 [1990] | N/A |
| WITTMER (M) | Floreana (life on the Galapagos Islands 1932-1957) [1961] | N/A |
| WOLFF (H) | Die deutschen kriegsgefangenen in Britischer [1974] | Military |
| WOODALL (R G) | The Postal History of Yukon Territory [1976] | N/A |
| WOODS INTeRNATIONAL | The Ryohei Ishikawa Collection: United States stamps & covers 1847-1869 | N/A |
| WOODWARD-CLARKE (R L) | Register of the registration labels of the United Kingdom: the 1945 small serials type [1979] | Registration |
| WORBOYS (D) | Madame Joseph forged postmarks [1994] | N/A |
| WOWERN (Eric V) | Gronland poststempler efeter 1938 / Postmarks after 1938, 16th ed | N/A |
| WRIGHT (A) | Court-hand restored or the student’s assistant in reading old deeds etc [1879] | N/A |
| WRIGHT (E K) & DRYSDALL (A R) | The Oates Correspondence: a postal history of Frank Oates’ travels in Matabeleland & Zambesia 1873-75 [1988] | N/A |
| WURTH (R) | Osterreichs orientalische post druch Balkan un Levante [1992] | N/A |
| WYSS (A) | The Post, a Universal link between men | N/A |
| YAG (O) & BASH (J K) | The pre-stamp postal markings of Mexico [1965] | N/A |
| YOULE (Dr J H) | Postmarks and cachets of the British Antartic Bases and South Georgia [2001] | N/A |
| YOUNG (M H) | The Postal History of Bromsgrove and District 1703-1994 [1994] | N/A |
| YVERT | Catalogue des estampilles et obliterations postales de France et des colonies francaises [1929] | Colonies, France |
| YVETOT | The perpetration of a local collection illustrated in support of the arguments by examples from the postal history of Tunbridge Wells & District [1953] | Great Britain |
| ZANCHE (L de) | Tra Constantinopoli e Venezia: dispacci di staato e lettere di mercanti dal basso medievo alla caduta della serenissima [2000] | N/A |
| ZAPHIRIOU (D P) | The History of the Septinsular postal services from their creation in 1803 up to the union of the Ionian Islands with Greece in 1864 [2003] | N/A |
| ZAPHIRIOU (D P) | Postal History of the Ionian Islands 1386-1864 [1987] | N/A |
| ZARESKI (M) | Fancy Cancellations on 19th Century United States Postage Stamps [1951] | N/A |
| ZILLIACUS (L) | From Pillar to Post: the troubled history of the mial [1956] | N/A |
| ZIMMERMAN (David M) | Free French Censorship in The Levant [1980] | Military |
