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Description: The present research tested the dimensionality and cross-cultural differential item functioning of the Short Dark Tetrad (SD4; Paulhus et al., 2021) in samples of university students (N = 804) from Italy (N = 268), Romania (N = 313), and the United Kingdom (N = 223), respectively. Multidimensional Item Response Theory was used to model the data, along with ordinal logistic regression for differential item functioning. The original theoretical and measurement ‘Dark Tetrad’ model accounting for the four antagonistic traits of Machiavellianism, narcissism, psychopathy, and sadism was generally supported in each of the three cultural contexts, representing a good fit to the data. However, we found metric non-invariance as well as non-negligible differential item functioning for several items in each of the four factors, in line with findings from previous research on country-based and cultural differences in antagonistic traits. Implications for theory and research are discussed.