Individual religiosity measures are used by researchers to describe and compare individuals and societies. However, the cross-cultural comparability of the measures has often been questioned but rarely empirically tested. In the current study, we examined the cross-national measurement invariance properties of generalized individual religiosity in the sixth wave of the World Values Survey. For the analysis, we used multiple group confirmatory factor analysis and alignment. Our results demonstrated that a theoretically driven measurement model was not invariant across all countries. We suggested four unidimensional measurement models and four overlapping groups of countries in which these measurement models demonstrated approximate invariance. The indicators that covered praying practices, importance of religion, and confidence in its institutions were more cross-nationally invariant than other indicators.