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The wrought nickel-base superalloy Waspaloy™ was studied under biaxi-al-planar cyclic loading at elevated temperature. The total strain and temperature con-trolled tests were carried out at laboratory atmosphere using a servohydraulic biaxial-planar tension-compression machine (Instron) equipped with a biaxial-orthogonal ex-tensometer and a high frequency heating device. The developed test configuration was verified by thermography and thermocouple measurements at predefined temperature profiles. Based on the measured principal strains in the gauge area, the principal stresses were calculated by the elastic unloading at the load reversal points of hysteresis loops. The cyclic deformation and fatigue behavior under proportional loading were compared to uniaxial tests at the same temperature as well as to literature data. The biaxial fatigue behavior is presented in cyclic deformation curves and finally, the fatigue life is reported.