Cerebral palsy is the most common cause of severe neuromotor impairments in children and occurs as a result of damage to the developing brain. Unilateral cerebral palsy (UCP) accounts for more than a third of all cases of cerebral palsy. It is characterized by a motor disorder localised on one side of the body with functional limitations due to impaired hand function. Brain damage caused by cerebral palsy is non-progressive, but symptoms can change under the influence of maturation, brain plasticity and therapeutic procedures. The goal of rehabilitation in people with UCP is to improve the use of the affected limb for daily bimanual activities and to achieve independence. One of the approaches that rehabilitates people with UCP is mirror therapy. Mirror therapy uses the visual illusion created by mirroring the unaffected limb and deceives the brain that the movement is performed by the affected limb, resulting in improved motor function of the affected limb. Studies of the effects of mirror therapy have shown that therapy is effective in people with UCP with contralateral corticospinal organization and that a bimanual approach to mirror therapy is more effective than unimanual. Furthermore, it was concluded that the use of mirrors led to a reduction in excessive neuromuscular activity and improved the functionality of the subjects ’hands. A positive effect is present in the areas of strength, grip strength, spasticity, finger dexterity, gross motor skills, hand movement pattern, efficiency and speed of movement, and motivation and concentration. Combining therapy with other approaches, such as physiotherapy, strength exercises, and HABIT therapy has proven beneficial. Compared to CIMT treatment, as the most commonly used approach to the therapy in persons with UCP, it was concluded that each therapy has its advantages. Studies of the use of mirror therapy in people with UCP have shown good feasibility of this type of therapy in this population.