Oláh or Olah is a Hungarian language surname, which means "Romanian", derived from the word volách, and from that vlach, meaning "Italian" or "speaker of a Romance language".
It's unclear how the surname came about. People who have this surname might have Romanian ancestry and possibly went through a process of Magyarization in the past.
Related names include Vlach and Olasz. The surname may may refer to:
Adrian Olah (born 1981), Romanian football playerDávid Oláh (born 1988), Hungarian football playerFranz Olah (1910–2009), Austrian politicianGeorge Olah (1927-2017), Hungarian chemistGergő Oláh (born 1989), Hungarian football playerGergő Oláh (singer) (born 1988), Hungarian singerIbolya Oláh (born 1978), Hungarian singerIstván Oláh (1926–1985), Hungarian politicianKarin Olah (born 1977), American artistKatalin Oláh (born 1968), Hungarian orienteererLóránt Oláh (born 1979), Serbian football playerNicolaus Olahus (1493–1568), Hungarian archbishopTiberiu Olah (1928–2002), Hungarian musician