This article reports the findings of a study on the attitudes of teachers and students concerning the language policy of the Moroccan educational system. Its main aim is to clarify the gap existing between the policy of Arabisation (i.e., the official adoption and utilization of Standard Arabic) and its practical implementation in science classrooms. Conducted in seven public and private high schools in two main cities in Morocco, the inquiry explores the attitudes of students and teachers towards their level of competence in Standard Arabic, the validity of Standard Arabic as a medium of science instruction, and the future status of Arabisation in science disciplines, in particular, and in education, in general. This attitudinal inquiry can be employed to describe the status of Arabisation in the Moroccan education system and to clarify some of the obstacles hindering its implementation.