Objectives: The aim of this study was to assess the knowledge and attitudes about obstructive sleep apnea (OSA) among doctors of dental medicine in Croatia. Additionally, we compared the knowledge and attitudes regarding OSA between general doctors of dental medicine and specialists and between doctors of dental medicine who previously had some education about OSA and ones that did not. Material and methods: There were 143 participants included in the study. The study was conducted using the Obstructive Sleep Apnea Knowledge and Attitudes Questionnaire (OSAKA) which was distributed to the participants through Google Forms. The questionnaire consisted of three parts. The first part comprised general questions. The second part consisted of 18 questions about the knowledge regarding OSA and the third part estimated attitudes about OSA through five statements. Correct Knowledge Score of Obstructive Sleep Apnea (CKS-OSA) was calculated based on correct answers on 18 questions, while possible total score was between 0 and 18 points. Results: CKS-OSA was 9.15±3.78 points, out of a possible 18 points. There was no statistically significant difference in knowledge regarding OSA between specialists and general dental medicine doctors in Croatia. However, dental medicine doctors that had some education about sleep disorders during their studying showed statistically significant better knowledge than the ones who did not have such an education (CKS-OSA 10.61±2.61 points vs. 8.88±390 bodova, P=0.027). Most of the participants showed positive attitudes towards OSA. Conclusion: This survey comfirmed the results of the ones that were conducted before showing that the general knowledge regarding OSA among doctors of dental medicine is insufficient. Also, they do not feel confident in diagnosing and treating those patients. This fact and the one that doctors of dental medicine who previously had some education about sleep disorders showed better knowledge than the ones who did not have such education are indicating the need for introducing sleep medicine teaching in dental medicine curricula and programs. However, most of doctors had positive attitudes towards OSA which shows they are aware OSA as a big problem of public health with increasing prevalence.