Abstract. This article introduces the new module Gender in Contemporary Europe: Rethinking Equality and the Backlash developed for Round 11 of the European Social Survey (ESS). The module represents the first large-scale, cross-national effort to comprehensively map contemporary gender attitudes using both established and innovative measures. It captures five interrelated contemporary concepts that have rarely been included in prior cross-national surveys available for public use: gender identity, sexism (hostile, benevolent, and modern), perceived and experienced gender discrimination, the salience of gender equality as a social value, and support for gender equality policies. Pretesting and cognitive interviews conducted across a group of participating countries highlighted both the value and the complexity of measuring gender-related constructs, particularly in relation to translation challenges, perceived item bias, and social desirability effects. As we introduce the new data set, we highlight four critical challenges for gender research: bias, gendered translation, response bias, and cross-national measures of sexism. We also provide details on how the module development tackled each of these.