The Small European Postal Administration Cooperation (SEPAC; also "...Cooperations"; also Small European Postal Administrations Cooperation) is an association of 13 European postal authorities: Åland, the Faroe Islands, Gibraltar, Greenland, Guernsey, Iceland, the Isle of Man, Jersey, Liechtenstein, Luxembourg, Malta, Monaco, and Vatican City. Luxembourg was not originally a member of SEPAC but it joined at the end of 2006. San Marino decided to leave and is no longer a member, as of March 2020. SEPAC is smaller than PostEurop.
The first joint issue of SEPAC postage stamps occurred on October 1, 2007, and the next in 2009; the sixth one was in September 2015. San Marino and Vatican City do not participate in these issues.
The following criteria are requisites for membership:
- The postal administration must be located in Europe.
- The postal administration must be independent.
- The postal administration must have a small market with more than 50% of its philatelic customers living outside the country.