Objectives: The aim of our study is to prove whether patients with psoriasis have an increased risk of developing obstructive sleep apnea compared to a control group. Subjects and methods: A total of 42 participants were included in this retrospective and observational study; 21 participants with a diagnosis of psoriasis, and the remaining 21 participants without diagnosis of psoriasis as a control group. A survey for patients with psoriasis and the STOP questionnaire were used. The result of the STOP questionnaire was compared between the control group and patients suffering from psoriasis. Results: The result of the STOP questionnaire in patients with psoriasis is significantly higher compared to patients without a diagnosis of psoriasis , i.e. the group of respondents suffering from psoriasis had statistically higher STOP questionnaire values results compared to the group of healthy subjects (P<0,001). No statistically significant difference was found in BMI value (t=0,827, P=0,413) between the control group (25,87 ± 3,80) and the group with psoriasis (26,95 ± 4,63). A statistically significant strong positive correlation was found between the intensity of joint pain according to the NRS scale and the results of the STOP questionnaire (P=0,004, r=0,600). No statistically significant correlation was found between the intensity of itching according to the NRS scale and the results of the STOP questionnaire. (P=0,202, r=0,290). Conclusions: Patients who are diagnosed with psoriasis have a higher risk of developing OSA according to the STOP questionnaire. In addition, according to the STOP questionnaire, the risk of developing OSA is higher if the patient claims to have severe pain in the joins as part of psoriatic arthritis, compared to patients without joint pain.