The present study examined disaster relief efforts by registered and other dietitians following the Great East Japan Earthquake to identify related problems. Based on this, the study discussed what is required to develop a“disaster relief system through inter‒professional collaboration”to cope with unanticipated disasters.
 On March 15, 2011, the Japan Dietetic Association（JDA）independently established the“Great East Japan Earthquake relief emergency headquarters”. The association along with these volunteers was committed to the establishment of a system for disaster relief activities with the support of Iwate, Miyagi, and Fukushima Prefectures：the number of registered volunteers was 978；a total of 1,588 dietitians were dispatched；and 602 became involved in relief work in the disaster‒stricken areas.
 Registered and other dietitians dispatched for disaster relief provided support and home care for evacuation centers, elderly facilities, and temporary housing, including dietary and nutrition advice and consultation, in cooperation and collaboration with administrative dietitians in disaster areas, registered and other dietitians of disaster headquarters in disaster‒stricken prefectures, the Primary Care for All Teams（PCAT）of the Japan Primary Care Association, disaster medical assistance teams（DMATs）, and volunteer groups.
 Through the course of the relief activities, the following problems were identified：difficulties in responding to varying needs in different phases, nutritional measures（population‒based and high‒risk approaches）, nutritional disparities among evacuation centers, necessity of a section to collect ever‒changing information on disaster areas in a comprehensive manner, importance of working cooperatively to establish a support system, and differences in volunteers’support skills.
 To facilitate disaster relief through inter‒professional collaboration, it is necessary for many different organizations to understand each other’s capabilities in the event of a disaster, methods to share problems, needs, and information among them and with new members, and the importance of local coordinators.