Blended learning course environments combine synchronous activities (in face-to-face or virtual classrooms) with asynchronous online activities, and they represent a fertile ground for enhancing student engagement. However, studying student engagement in these environments requires the development of a measurement scale, which is the purpose of this paper. The new measurement scale Échelle multidimensionnelle d’engagement des étudiants dans des modalités de cours hybrides (EMEECH) provides researchers and instructors with tools for assessing student engagement in blended courses (blended, blended online or blended synchronous) from a multidimensional perspective. Its elaboration is presented, accompanied by evidence of validity for its internal structure obtained through exploratory factor and internal consistency analyses based on diversified data from three academic institutions. A first sample (n 1 =234) allowed identifying three dimensions to student engagement: emotional-cognitive, social and behavioral. A second sample (n 2 =231) provided further evidence of the internal structure of the new scale by confirming its factorial structure and its very good internal consistency.