BACKGROUND Sexually-transmitted infections (STIs) are serious public health problem, being acquired by more than 1 million people every day worldwide. OBJECTIVE Assess the knowledge, attitudes, risky behaviors and preventive practices related to STIs among medical and non-medical faculties students from Bialystok. METHODS In 2018 an original anonymous survey was carried among 168 subjects from medical and 142 from non-medical universities. They filled 37 questions: general and specific regarding STI. Statistical analysis was performed using Chi-Square test, statistically significant difference was at p=0.05. RESULTS In the group 80,6% were females and 19,4% males, with a mean age of 21,9 years. Over 73% were sexually active and almost half of them admitted risky sexual behavior in the past. Almost 16% have ever done an examination for STIs. HIV remains the best known STIs, while hepatitis B was known mainly among medical students. Three fourth students knew that STIs could be asymptomatic. Over half of the students knew that vaccinations against STIs were available and 88,6% of them heard about the HPV vaccine. There was statistically significant difference between the groups regarding the knowledge of diseases transferred sexually, causative agents, history of STI examination, vaccines against STIs. CONCLUSIONS Almost all participants identified HIV as STIs. Unfortunately, knowledge about other STIs is still at lower level. Both groups have indicated the Internet as a source of knowledge about STIs and the need to acquire additional education about these diseases. To conclude, non-medical students have less awareness about STIs.