— A set of lifelogs is a dataset that describes a person’s life. A high quality and large set of lifelogs is expected to be useful for many applications. Only by integrating the logs that are already available from various devices and creating semantic relationships among them, we can build a useful lifelog ontology that can support various applications. In this paper, we propose Entity-Event Lifelog Ontology Model (EELOM) for designing lifelog ontology that can be used for integrating various available data sources.