The study tries to discover to what extent knowledge of the local language of a diplomat’s host country, and language skills generally, are considered while selecting candidates for EU delegation heads in the European External Action Service. With this aim, the study examines possible correlations between languages spoken by the EU delegation heads and the official languages in their respective host countries. It is concluded that a correlation often exists between the language(s), and especially mother tongues, spoken by the EU delegation heads and the official language(s) in the countries to which they are posted and, thus, a candidate’s knowledge of the host country’s official language is usually taken into account in the selection of candidates for EU delegation heads, although this criterion seems to carry different weight for candidates from various EU member countries