Objectives:The aim of our study is to show the prevalence of temporomandibular joint disease (TMD) in fibromyalgia (FM) patients in Turkish population and to evaluate the relationship between vitamin D levels of FM patients with TMD. Materials and Methods: Patients diagnosed FM in the last 4 months were examined in terms of TMD using DC/TMD criteria. By using biochemical data of the patients included in the study, the relationship between vitamin D levels and TMD was interpreted. Results: Among the 39 FM patients who underwent temporomandibular joint examination (mean age 39.8; age range 18-59), the number of patients with TMD (muscle pain, joint pain, mouth opening limitation, disc displacement, degenerative joint disease) was 30 (29 female, 1 male), while the number of patients without any TMD was found 9 (7 female, 2 male). No statistically significant difference was found between those with TMD and those without TMD in terms of vitamin D (Mann-Whitney U test, D vit). Conclusions: Dentists should be aware that patients with widespread pain in the temporomandibular joint area may be candidates for FM and should be careful in evaluating laboratory tests of these patients. The prevalence of TMJ in FM patients and its relationship with vitamin D should be examined with new studies with large patient participation.