The　aim　of　this　study　is　to　reflect　on　where　Omega-The　International　Journal　of　Management　Science　(Omega)　comes　from　and　evaluate　where　Omega　currently　is　in　a　field　that　arguably　paves　the　way　for　the　challenging　task　of　identifying　future　directions　and　trends.　To　achieve　this　goal,　this　study　presents　a　bibliometric　overview　of　Omega　over　the　past　40　years,　from　1979　to　2018.　First,　this　study　outlines　the　basic　bibliometric　profile　of　Omega.　Second,　VOSviewer　is　employed　to　visualize　the　collaborative　relationships　that　Omega　has　with　other　journals　to　show　how　Omega　has　linked　to　them　over　the　past　40　years.　Finally,　co-occurrences　of　keywords　are　analysed　and　strategic　diagrams　are　built　to　reveal　the　thematic　trends　in　Omega.　The　results　show　that　Omega　has　substantial　influences　in　the　field　of　operational　research　and　management　science　(OR&MS),　with　contributors　from　all　over　the　world.　Omega　has　strong　connections　with　other　leading　journals　in　the　fields　of　OR&MS　and　engineering.　The　mainstream　research　of　Omega　mainly　focuses　on　production　and　manufacturing　management,　mathematical　modelling　for　optimization　problems,　supply　chain　management,　data　envelopment　analysis,　multicriteria　and　decision　making.　Moreover,　motor　themes,　highly　developed-and-isolated　themes,　emerging-or-declining　themes,　and　basic-and-transversal　themes　are　identified.　The　study　provides　strong　evidence　that　Omega　has　been　a　story　of　success,　and　the　findings　of　this　study　will　support　decision　making　for　the　Omega-related　scientific　community.　(C)　2019　Elsevier　Ltd.　All　rights　reserved.