The　purpose　of　this　study　was　to　investigate　demographic　variables　in　knowledge　sharing.　The　study　conducted　a　quantitative　study,　and　the　participants　were　IT　engineers.　Random　sampling　was　used.　The　questionnaires　were　sent　to　25　IT　companies　by　mails.　The　cover　of　the　questionnaire　explained　the　purposes　of　the　study.　A　self-addressed　stamped　envelope　was　enclosed.　250　copies　of　questionnaires　were　sent　and　84　copies　were　returned.　The　response　rate　was　33.6%.　The　data　was　analyzed　by　the　independent　t-test　and　One-way　ANOVA　in　IBM　SPSS　22.　The　findings　of　the　study　show　(1)　knowledge　sharing　behavior　differs　in　terms　of　education　level,　(2)　knowledge　sharing　behavior　has　significant　influence　in　terms　of　profession,　and　(3)　knowledge　sharing　behavior　does　not　have　significant　influence　in　gender,　age　group,　position　grade,　job　tenure,　workplace,　marital　status,　and　number　of　children.　©　2018　Association　for　Computing　Machinery.