In this study, the pre-service teachers' attitudes towards the educational inclusion for students with Autism Spectrum Disorder (ASD) were investigated to identify their attitudinal patterns and predictors. An attitudinal survey was conducted with 264 pre-service teachers in a teacher training programme in Malaysia. The study involved 151 special education pre-service teachers and 181 pre-service teachers in Special Education, Sciences, and in English teacher training programmes, in order to identify the effects of teaching specialisations and societal attitude on their inclusive education attitudinal measures. The findings revealed that the special education pre-service teachers were less in favour of the total inclusion of students with ASD in the mainstream, when compared with the non-special education pre-service teachers. The findings also revealed the combined effects of societal attitude and a categorical teacher training model in shaping the pre-service teachers' attitudes towards inclusive education for the students with ASD in Malaysia. Such combined effects offered a perspective to explain the delay in the implementation of inclusive education, and also the prospect of its future development in the Southeast Asian region.