<p>  The purpose of this study was to examine the background and influence of the integration between the Netherlands Olympic Committee and the Netherlands Paralympic Committee. We adopted the framework of a neo-institutional theory. Semi-structured interviews were conducted with two staff of the Netherlands Olympic Committee and the Netherlands Paralympic Committee. In addition, we collected data from the archival materials to complement and check the information obtained from the interview. The analysis was based on thematic analysis. An important milestone in this integration was marked by the signing of a declaration on the initiative of the former State Secretary of the ministry of Health, Welfare and Sports. This declaration was the initiative to integrate disability sport in mainstream sport. The Netherlands Olympic Committee was under formal and positive pressure to sign a country-led declaration, and this integration was " coercive isomorphism." The integration had the advantages of "sharing resources" and "getting fund", led to the strengthening of institutional legitimacy. Also, it had influences on "integration of the national federations and the national disability sport organizations," "grassroots expansion in region sport clubs," and "inclusion of society." Notably, these influences by integration were considered to "mimetic isomorphism" and "normative isomorphism." This study has contributed to the theoretical accumulation of a neo-institutional theory in the context peculiar to sport.</p>