This article presents a meta-analysis of the studies related to teachers' attitudes towards inclusive education for students with disabilities. It covers a total sample of 40512 in-service or pre-service teachers from 55 different countries. Globally, the teachers' attitude is positive. A meta-regression analysis shows that the attitude has notably progressed from 2000 to 2020. In addition, teachers' attitude is more favourable when the country's Human Development Index (HDI) is higher and special education teachers are more favourable to inclusive education than ordinary ones.