Incubators for nonprofit organizations (NPOs) are agencies that provide diverse services to support the creation, survival, and early stage growth of NPOs. A primary task of such agencies is to provide NPO clients access to resources through networking. Drawing on the literature on intermediary support organizations (ISOs) and tie formation and a comparative case study of three incubators for NPOs in China, this study examines differences in their resource networks for supporting NPOs and the various factors associated with those different network characteristics. The analysis shows that the types of organizations that play a pivotal role in each case's resource network—business organizations, governmental organizations, and NPOs—are different. Each of these distinctive network characteristics is individually associated with organizational influence, resource dependence, and institutional design. These differences in resource networks and the mechanisms underlying network formation contribute to the literature on ISOs.