Background/Aim. Human immunodeficiency virus (HIV) continues to be a major global public health issue having claimed more than 35 million lives so far. Seafarers belong to a group of migrant workers whose working and living conditions are confined for a long time. Their way of life put them at a high risk of HIV infection and other sexually transmitted infections (STIs). The aim of this study was to assess the level of knowledge about HIV and other STIs