This paper investigates grammatical difficulty from the perspective of Saudi university students, of EFL as well as from the perspective of university teachers. It aims to find out which English grammar features are more difficult/less difficult than others. Furthermore, it attempts to determine the reasons and causes that account for such grammar difficulty. Questionnaires and semi-structured interviews were the two research instruments used in this study. A total number of 103 students and 85 university teachers took part in the questionnaire, while only 20 teachers and 25 students responded in the interview. All the participants were from Aljouf University (males and females). The results showed that some English grammar features were more difficult and some were less difficult than others. The obtained difficulty order determined by EFL learners and the one obtained by the teachers' perceptions were compared. Some similarities and differences were found to exist in the rank order of the features for the two groups. The findings of the study may be beneficial to syllabus designers, material developers, teachers and EFL learners.