The concept of terminology planning is manifold and it can take place at different levels. As Infoterm (2013) has stated: “Terminology planning is an activity that is carried out by many institutions, organisations or communities for an array of purposes.” In Sweden, terminology planning activities are also carried out by private companies and other types of organisations but focus here will be on public terminology planning. Following a brief introduction about the concept of terminology planning and early (nomenclature) initiatives of scientists in botany and chemistry, the article will highlight important terminology planning activities and events during the three phases of the existence of the national centre for terminology, (Tekniska nomenklaturcentralen/Terminologicentrum TNC): a pre-TNC period, a TNC period and a post-TNC period, and also investigate particular activities like dissemination. Other public institutions and groups will also be covered, e.g. joint terminology groups and the national terminology association Terminologifrämjandet.