The current study documents differences between pre- and in-service content area teachers’ beliefs about: whether English language learners (ELLs) should be included in content area classes, the kind of instructional support (IS) they should receive, and responsibility for ELLs’ language and academic achievement. The findings revealed that pre- and in-service and female and male teachers held similar beliefs about ELLs’ inclusion in mainstream classes. However, several significant differences were found between both service and gender groups' beliefs about responsibility for ELLs’ language and academic development.