It could be said that developmental language disorder (DLD) is becoming increasingly recognized not only by speech-language pathologists, but also by parents and other specialists working with children. It is of great importance to raise awareness of DLD and to properly treat it considering its possible influence on school achievement and social relationships. On that subject speech-language pathologists have achieved a considerable progress. But, can we claim the same for all language modalities? Can speech-language pathologist recognize DLD in sign languages with the same accuracy as in spoken languages? This master thesis will address these questions. There will be an overview of foreign studies, especially those regarding hearing impairment and sign language linguistics. A special overview will be given of DLD in sign languages. There are great differences between countries such as United States of America and Great Britain compared to Croatia, particularly in terms of sign language use in language interventions therapy and education of the Deaf. Croatian sign language (HZJ) still does not have the necessary support in Croatia. Thus, this work will mainly focus on DLD in other sign languages due to lack of research of DLD in HZJ. At last, basic information about first steps needed for handling DLD in HZJ will be provided.