Aden is a city in Yemen. Aden's location made it a popular exchange port for mail passing between places around the Indian Ocean and Europe. Mail is known to exist from June 15, 1839, although a regular postmaster was not appointed until 1857.

Once Aden became a crown colony it received a series of stamps known as the Dhow set

Aden used postage stamps of British India until it became a crown colony on April 1, 1937. Although these stamps carried no special identification they may be recognised through the use of the number 124 in postal cancellations, which was assigned to Aden as part of the Indian postal number system.

In 1939, a new issue of stamps included a portrait of King George VI, but the sultans in Hadhramaut (whose territories had been under the British Aden Protectorate since the 1880s) objected to this, and so the British government issued separate stamps in 1942, but with the additional inscriptions Kathiri State of Seiyun and Qu'aiti State of Shihr and Mukalla (later Qu'aiti State in Hadhramaut), plus portraits of the respective sultans. All of these types were valid in Aden and the Aden Protectorate.

Aden Hadhramaut 1949 RSW 5R Green SG15 Good MNH
Aden Hadhramaut 1951 Surch Set of 8 SG20-27 Fine MNH & LMM
Aden 1937 Set of 12 SG1-12 Fine & Fresh LMM
Aden 1939 2R Deep Blue & Magenta SG25 Fine MM
Aden 1939 5R Red-Brown & Olive-Green SG26 Fine LMM
Aden 1939 10R Sepia & Violet SG27 Fine LMM
Aden 1948 RSW Set of 2 SG30-31 Fine LMM
Aden 1951 2s on 2R Deep Blue & Magenta SG44 Fine LMM
Aden 1951 5s on 5R Red-Brown & Olive-Green SG45 Fine LMM
Aden 1951 10s on 10R Sepia & Violet SG46 Fine LMM
Aden 1951 Set of 11 SG36-46 Fine MNH & LMM
Aden Seiyon 1951 Set of 8 SG20-27 Fine MNH & LMM
Aden 1937 Set of 12 SG1-12 Fine & Fresh MM
Aden 1939-48 Set of 14 SG16-27 Fine & Fresh MM
Aden 1949 UPU Set of 4 SG32-35 Fine LMM
Aden 1951 Set of 11 SG36-49 Fine MNH 70c is LMM
Aden Hadhramaut 1942 Set of 10 SG1-11 Good MNH
Aden Seiyun 1942 Set of 11 SG1-11 Good MNH
Aden 1951 2s on 2R Dep Blue & Magenta SG44 V.F MNH
Aden 1937 Set of 12 SG1-12 V.F VLMM & MNH
Aden 1937 Set of 11 to 5R SG1-11a Fine Used
South Arabia Fed Seiyun 1966 Churchill Set of 8 SG91-98 V.F VLMM
Aden 1953-63 Extended Set of 33 SG48-72 All Perfs & Shades Ex SG68a 72a V.F VLMM
Aden 1939 Set of 13 SG16-27 in V.F MNH Side Marginal Pairs