The paper is an attempt to investigate high school students' beliefs about English language grammar. The first part o the paper is a theoretical overview of learners' beliefs and attitudes and its importance for second language acquisition. It also explores previous research done in the area of learners' beliefs about grammar. The second part is a presentation of research whose aim was to investigate learners' beliefs about grammar, the connection between their beliefs and perception of teaching methods and the relationship between their beliefs and perceived level of success. The research was conducted on 200 high school students in three high schools in Osijek. The results show that most learners hold negative beliefs about English language grammar and that most learners find it boring. Most learners also experience difficulties when learning grammar. Despite this, learners recognize the need to learn grammar. One of important elements that influence learners' beliefs is their success and the results show that learners who perceive themselves as successful show greater preference to learn grammar than the learners who believe to be less successful in grammar. When it comes to the relationship between learners' beliefs and perception of teaching methods, results show that most learners prefer explicit grammar teaching.