The mechanical behavior of austenite was investigated in a TRIP duplex stainless steel (TDSS). Uniaxial tensile testing was performed and the microstructure was characterized using electron backscatter diffraction. A strong <111> texture develops along the loading direction (LD) due to preferential martensitic transformation and grain rotation. Austenite oriented with <112> and <100> parallel to the LD transform preferentially, since multiple slip planes activate for these orientations. These observations agree with observations in single-phase austenitic alloys with low stacking fault energy. In conclusion, it is indicated that the stability of austenite grains towards martensitic transformation is mainly dictated by crystallographic orientation.