Olguin or Olguín is a surname in the Spanish speaking world. Notable people with the surname include:
Adriana Olguín (1911–2015), Chilean lawyer and politician Carlos Olguin-Trelawny, Argentine film director and screenwriter Cristián Olguín (born 1963), Chilean footballer Felipe Solís Olguín (1944–2009), Mexican archaeologist, anthropologist and historian Fernando M. Olguin (born 1961), American judge Héctor Pedraza Olguín (born 1966), Mexican politician Jorge Olguín (born 1952), Argentine footballer Jorge Olguín (director) (born 1973/1974), Chilean film director José Olguín (footballer) (1903–1991), Chilean footballer José Olguín (water polo) (1926–1998), Mexican water polo player Leonardo Olguín (born 1975), Argentine tennis player Luciano Olguín (born 1982), Argentine footballer Néstor Olguín (born 1988), Mexican footballer Otilio Olguín (born 1931), Mexican swimmer and water polo player Roy Argel Gómez Olguín (born 1973), Mexican politician Sergio Olguín (born 1967), Argentinean author, journalist and literary critic