Hosszú or Hossu is a surname. Notable people with the surname include:
Katinka Hosszú (born 1989), Hungarian swimmer Emil Hossu (1941–2012), Romanian actor Iuliu Hossu (1885–1970), bishop of the Romanian Greek Catholic Church Francisc Hossu-Longin (1847–1935), lawyer and memoirist Elena Pop-Hossu-Longin (1862–1940), Romanian women's rights activist
See also Hossu