<jats:title>Abstract</jats:title><jats:p>The chemical composition of essential oils from 22 <jats:italic>Eucalyptus</jats:italic> species growing in Uruguay are described. It was found that 1, 8‐cineole, citronellal, <jats:italic>p</jats:italic>‐cymene and benzaldehyde are the main constituents.