Stepan Rostomyan (born April 4, 1956) is a famous Armenian composer.

He is one of Armenia’s key figures of the contemporary music scene, as well as a composer whose works have been performed and broadcast internationally.

Rostomyan studied in Yerevan Komitas State Conservatory composition faculty in classes of Professor Ghazaros Saryan and Avet Terteryan. He became one of the most well known post Soviet Union composers who commissioned pieces for leading soloists and ensembles such as Oleg Kogan, Yuri Bashmet, David Geringas, London Sinfonietta, Ensemble Modern, Paragon Ensemble, among others. Four times the Scottish Arts Council funded commissions to Rostomyan, and each of the premieres and performances according to Herald was rated as “sensational success” or a “smash hit”. Stepan Rostomyan is an author of chamber and symphony pieces, mono opera, vocal and instrumental compositions. Many of his pieces, according to Leonardo US magazine “became popular in the West”. One of his recent pieces “Tagh of Angels” a triple of Taghs (medieval form of Armenian sacred song) has been numerously performed in Switzerland, UK and America to the highest acclaim. Rostomyan authored music to many beloved films and theatrical performances. Rostomyan is a frequent lecturer of Armenian music and culture in international conferences. In 1989 he was invited to work at Glasgow University’s electro acoustic music studio and has afterwards established an electronic music department at the Yerevan Conservatory. Students of Rostomyan’s class are leading young composers of Armenia who are winners of the first places at prestigious international composing competitions. Mr. Rostomyan is one of "...about 500 leading composers of the second half of our century..." from all over the world whose life and activity are included in the Contemporary Composers reference book, Gale Research International.