Title: Support varieties for transporter category algebras Author: Fei Xu Address: Departament de Matem\`atiques, Universitat Aut\`onoma de Barcelona, 08193 Bellaterra, Spain. Abstract: Let G be a finite group. Over any finite G-poset P we may define a transporter category as the corresponding Grothendieck construction. We introduce a support variety theory for the category algebras of transporter categories. It generalizes Carlson's support variety theory and provides a class of algebras on which Snashall-Solberg's (Hochschild) support variety theory applies. Various properties will be developed. Particulary we establish a Quillen stratification for modules.