IWATA Masami is a Japanese sociologist and Professor Emeritus at Japan Women's University. Her research interests include social welfare policy, poverty and social exclusion theory. She graduated from the Department of Social Welfare, Japan Women's University, in 1969 and obtained a PhD in Social Welfare in 1994. She worked at Osaka City University before going on to become Assistant Professor at Tokyo Metropolitan University in 1986, and Professor in 1994. She became Professor in Faculty of Human Sociology, Japan Women's University, in 1998.