Hugó Veigelsberg (2 November 1869, Pest – August 3, 1949, Budapest) was a noted Hungarian editor and writer who usually published under the pen name Ignotus (Latin for "unknown").
He was distinguished for the lyric individuality of his poems, stories, and sociological works.
His father was the journalist Leó Veigelsberg, and his son Pál (Paul) Ignotus (1901–1978) was a journalist and writer who worked for the BBC during World War II.