Hiltrud Kellner, sometimes Hiltrud Kellner de Zozaya[1] (born 1913, date of death unknown) was a Uruguayan composer of Romanian origin.
Kellner was born in Transylvania, which was then part of the Austro-Hungarian Empire.
Kellner was married to the Mexican composer Carlos Zozaya, and with him lived in Uruguay for many years.
He was among her instructors; other teachers included Enrique Casal Chapí [es] and Héctor Tosar.
She composed a number of works for orchestra, including a piano concerto.