This article offers a systematic review of research trends and methodology, with a focus on the state and order of knowledge regarding service orientation in hospitality and tourism research. A search algorithm was created through Web of Science and Scopus using search words related to service orientation and criteria regarding hospitality and tourism, yielding 154 articles. Duplicates and articles that did not focus on hospitality and tourism or did not have service orientation as their focus were removed, leaving 50 articles that were reviewed thoroughly and are the bases of the results. The review’s main findings are that discussion of service orientation seems to be selective in categorizations and bound mostly to employee hospitableness, therefore leaving out organizational culture, strategy, and process. There is, however, evidence in recent literature that scholars are taking a more holistic view of the phenomena. Most articles contribute to knowledge-building through the third order of knowledge, leaving little room to define concepts or gather mutual understandings through empirical data. Based on our findings, we recommend conscious and continuous building of tools and methods that will contribute to a more in-depth and holistic understanding and measurement of service orientation in hospitality and tourism.