Tomás Marco Aragón (Madrid, September 12, 1942) is a Spanish composer and essayist.
He studied violin and composition, combining this activity with studies in Law. He expanded music studies in France and Germany, where he received classes from Pierre Boulez, György Ligeti, Karlheinz Stockhausen, Bruno Maderna and Theodor Adorno, among others.

He is the author of several books and articles on contemporary Spanish music and the Spanish National Music Award.

He also followed some courses in Psychology, Sociology and Performing Arts. In 1967 he was assistant to Stockhausen.

He was Professor of New Techniques at the Conservatory of Madrid and Professor of Music History at the National University of Distance Education. He has published several books and taught courses in institutions and universities in Europe and America. He has practiced music criticism in various media.

He worked eleven years in the musical services of National Radio of Spain being National Prize of Broadcasting and Prize Waves. From 1981 to 1985, he was Director-Manager of the National Autonomous Orchestra and Choir Organization of Spain and between 1991 and 1995 Technical Director of the same ensembles. From 1985 to 1995 he was Director of the Center for the Dissemination of Contemporary Music creating his electroacoustic laboratory and the International Festival of Alicante whose first eleven editions he directed. Since 1993 he is a full member of the Royal Academy of Fine Arts of San Fernando. From 1977 to 1996 Director of SGAE. In 1996 Director of Festivals of the Community of Madrid. From May 1996 to July 1999, General Director of INAEM. In 1998 Doctor Honoris Causa by the Complutense University of Madrid.

As a composer he is the author of five operas, a ballet, seven symphonies, choral, chamber music, etc. He is currently dedicated exclusively to writing music and music.