This study explores the attitudes of English teachers, both Korean and non-Korean, towards Korean English (KoE) in South Korea. Data about these attitudes were collected via 204 questionnaires and 25 post-survey individual interviews, from two major regions, Busan Gyeongnam and Seoul Gyeonggi, and were analysed both qualitatively and quantitatively. The results indicate that the majority of participants displayed a positive attitude towards KoE, especially regarding to the cognitive component of attitude, while they showed confused and conflicting attitudes in the behavioural element. The unique features of KoE, its intelligibility, demographic and widespread use of KoE were perceived by participants as the most influential factors shaping their cognitive attitudes towards the language. Language variation and an acceptance of a pluralistic model of English language norms played a critical role in developing positive attitudes towards KoE in both the cognitive and behavioural components of participants attitudes.