Contemporary public administrations all over the world are exploring new service provision models that adhere to citizens needs. Recently, the "life-event" concept was introduced as a guiding metaphor for presenting and providing integrated public services. A life-event includes all public services that are related to a specific situation that citizens face. Although the concept of lifeevents is increasingly important for public administrations, the relevant scientific literature is limited. In this paper we present the main classes of an ontology for modeling life-events. It is anticipated that the use of this ontology will facilitate domain experts in public authorities to model life-events in a straightforward manner.