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Bridging psychological research exploring emotional complexity and research in the natural sciences on the measurement of biodiversity, we introduce—and demonstrate the benefits of—emodiversity: the variety and relative abundance of the emotions that humans experience. Two cross-sectional studies across more than 37,000 respondents demonstrate that emodiversity is an independent predictor of mental and physical health—such as decreased depression and doctor’s visits—over and above mean levels of positive and negative emotion. These results remained robust after controlling for gender, age, and the 5 main dimensions of personality. Emodiversity is a practically important and previously unidentified metric for assessing the health of the human emotional ecosystem.