In recent years, environmental psychologists have shown interest in the notion of connection to nature, and considered it to have an important role in helping mitigate the environmental crisis. Together they have developed a number of concepts and measures related to this notion. However, the convergence or divergence of these concepts and measures has rarely been examined. The present research thus aims to empirically examine their similarities and differences. Using one undergraduate Hong Kong Chinese sample (N = 322) and one diverse American sample (N = 185), it demonstrates that these measures can be considered as markers of a common construct: They were strongly inter-correlated, converged to a single factor, shared highly similar correlations with various criterion variables, and did not show much unique predictive power when their common factor was controlled for. Nevertheless, there is also evidence of divergence: Some measures had stronger correlations with the criterion variables than did others, and had unique, though small, incremental predictive power. These findings bear important implications for the theoretical understanding of connection to nature. On the one hand, recognizing the commonalities among the various concepts and measures allows one to integrate existing research findings. On the other hand, identifying the distinctiveness of some concepts and measures reveals that certain ways of conceptualizing connection to nature (e.g., a multidimensional framework) are promising. Directions for future research are suggested accordingly.