While rich literature examines the relationship between volunteers and volunteer organizations, cross-sectoral difference in volunteer involvement remains under-researched. Most previous studies addressed primarily nonprofit organizations but paid inadequate attention to the increasing diversity of volunteer involving organizations such as governments, corporations, and professional associations in the past years. Conducting 441 surveys with eldercare volunteers in Beijing, China, this study compares volunteer involvement between the four major categories of volunteer organizers, including public institutions, neighborhood organizations, nonprofit organizations, and enterprises. It finds that there were no significant cross-sectoral differences among the volunteers both in their perception of volunteering and in their intent to remain with their current organizers, controlling for their personal characteristics. However, the cross-sectoral differences in volunteers’ motivation, participation, and some satisfaction aspects were significant. This study reveals a great variation of sectoral difference in volunteer involvement and concludes with implications and suggestions for future research.