This is the peer reviewed version of the following article: Šeruga D, Bešter T, Nagode M, Klemenc J. Determination of Stress–Strain Behaviour of Magnesium Alloy AZ31 under Variable Thermomechanical Loading. Fatigue Fract Eng Mater Struct. 2021; 1–9, which has been published in final form at https://doi.org/10.1111/ffe.13417. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self- Archived Versions.