Teachers have a very significant role in the implementation of the CEFR effectively. Teachers working at MONE have been offered training related to the CEFR; however, not every teacher had access to the training around Turkey. That is why; what language teachers know about the CEFR and how they implement the principles of the document needs to be investigated. This study aims to find out language teachers' views on the use of the CEFR. The researchers conducted the study among English language teachers working at private and state secondary and high schools in different cities around Turkey. Quantitative data analysis has been used to reveal the differences between the perceptions of English teachers regarding the CEFR. The findings of the study revealed that teachers working at the private schools are more aware of the practices of the CEFR in their teaching.