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PTT (German: Post, Telefon und Telegraph, French: Postes, téléphones et télégraphes, Italian: Poste, telefoni e telegrafi) was the Swiss Postal Telegraph and Telephone agency, formed in 1928.

In the course of the international trend towards liberalisation of the telecommunications market, it was transformed into two public service companies on January 1, 1998, Swiss Post and Swisscom. While Swiss Post remained a government agency with a partial service monopoly (it was converted into a statutory Aktiengesellschaft in 2013), Swisscom became a competitor on a liberalised telecommunications market and is an Aktiengesellschaft of which the Confederation holds a majority of shares.

The historical documents concerning the organization and the management of the Directorate General of Posts, the District Postal Services as well as the individual post offices are accessible at the PTT Archive.^[1]