This paper details the development and validation of a new research instrument called the ethically minded consumer behavior (EMCB) scale. The scale conceptualizes ethically minded consumer behavior as a variety of consumption choices pertaining to environmental issues and corporate social responsibility. Developed and extensively tested among consumers (n = 1278) in the UK, Germany, Hungary, and Japan, the scale demonstrates reliability, validity, and metric measurement invariance across these diverse nations. The study provides researchers and practitioners with a much-needed and easy-to-administer, valid, and reliable instrument pertaining to ethically minded consumer behavior.