Eusebius Mandyczewski (Ukrainian: ??????? ????????????? Evsevij Mandycevskyj, Romanian: Eusebie Mandicevschi; 18 August 1857, in Molodiya – 13 August 1929, in Vienna) was a Romanian musicologist, composer, conductor, and teacher.
He was an author of numerous musical works and is highly regarded within Austrian, Romanian and Ukrainian music circles.