Background and Objective: Psoriatic arthritis (PSA) is a multifactorial disease that affects 5-8% of patients with psoriasis. This disease is rarely reported in temporomandibular joint (TMJ). Female patients are generally prone to temporomandibular disorders (TMDs), and disorders affecting this joint cause secondary symptoms such as general mouth and face pain, headache, masticatory myalgia, and sleep disturbance. A rare case of temporal bone and temporomandibular joint involvement in psoriatic arthritis is reported here. Case Report: The patient is a 62-year-old woman who referred with pain in the right ear, physical imbalance, restricted mouth opening, along with the habit of clenching. CBCT findings showed evidence of reduced joint space on the right and left TMJ, the presence of erosive lesions on the right condylar head. Dehiscence of the roof of the middle ear was also present on the right and left sides. Also, the petrotympanic fissure or the foramen tympanicum was open on the right and left sides. She had previously used a soft night guard on the right side for TMJ pain, but due to the treatment failure, a prosthodontist recommended the use of a hard night guard. Conclusion: Based on the results of this study, temporal bone involvement should also be considered in people with a history of psoriasis.