The PETROLEUM PHILATELIC SOCIETY INTERNATIONAL (PPSI) is the society for collectors of stamps, covers and related items on the subject of oil, natural gas, and the petrochemical industry.

The PPSI is a study unit of the American Topical Association and is Affiliate 170 of the American Philatelic Society.

The society has members throughout the world. Many of our members are, or have been, involved in the oil or gas industries but this is by no means a requirement, and we welcome new members from all walks of life.

We publish a quarterly journal, The Petro-Philatelist. In addition catalogues of world petroleum stamps and petroleum related revenue stamps are produced although all these documents are available only to members of the society.

Maintaining the catalogue of petroleum stamps is a significant undertaking in view of the number of new stamp issues, particularly as these need to be audited, to ensure that they are genuinely petroleum related. Updates to the catalogue are issued regularly as part of each edition of The Petro-Philatelist.