Purpose: The effects of Instrument Assisted Soft Tissue Mobilization (IASTM) on cervical disc herniation (CDH) have not been extensively studied. The study aimed to investigate the effect of the IASTM technique on pain, functionality and psychology in CDH. Methods: A two-armed randomized controlled trial was carried out with 24 patients with CDH. Participants were randomized into two groups: conventional physiotherapy (n=12) and IASTM plus conventional physiotherapy (n=12). A conventional rehabilitation consists of a hot pack, electrotherapy, and exercises five days a week for four weeks. IASTM technique has been used for two sessions per week for four weeks. Patients were assessed with Visual Analogue Scale (VAS), Neck Disability Index (NDI), Copenhagen Neck Functional Disability Scale (CNFDS), Hospital Anxiety and Depression Scale (HADS). Results: Both groups had improvements in VAS scores (p