Gender as a research category and feminist approaches open up new avenues and perspectives for sustainability research. These perspectives relate to the production of knowledge, terms, and concepts; they relate to the questions to be asked and the framing of the problem, but they also have impacts on coping strategies. Feminist critique in the field of sustainability is literally fundamental, it’s radical. It throws light on the „other“, on what is usually excluded or forced in the shade, whereas its inclusion is fundamental to the development of society. So far, power, questions of domination, and hierarchies are blind spots in mainstream sustainability research. Critical approaches are missing. However, if sustainability research wants to sustain, unfold, and expand its transformative, critical-emancipatory potentials, it has to rely on critical - old and new - theories and to combine them. Central issues, topics, and alternatives of feminist sustainability research are presented in the article.