The article aims to draw attention to the linguistic rights of the Deaf in Poland and their legal source. Deaf people’s right to Polish sign language stems from their disability. This approach is incorrect. The title entitlement is the natural right of the deaf, derived from his dignity. In turn, the principle of human dignity is the gate leading to its “positivization”. On the other hand, recognizing the constitutional nature of the right to Polish sign language strengthens the legal basis of the deaf ’s claims against the state and justifies the legal protection of this language. The recognition of the right to Polish sign language allows the deaf to the full and equal exercise of the rights and freedoms guaranteed by the Constitution of April 2, 1997.