Gustaaf

Gustaaf may refer to:


 * Gustaaf Van Cauter, (born 1948), former racing cyclist
 * Gustaaf Deloor (1913–2002), Belgian road racing cyclist
 * Gustaaf Eeckeman (1918–1975), Belgian football left winger
 * Gustaaf Adolf van den Bergh van Eysinga (1874–1957), Dutch theologian
 * Boudewijn Albert Karel Leopold Axel Maria Gustaaf (1930–1993), King of the Belgians from 1951 until his death
 * Gustaaf Hermans (born 1951), former Belgian cyclist
 * Gustaaf Bernard Jozef Hiltermann (born 1914), Dutch journalist, jurist, political commentator, publisher, historian
 * Gustaaf Hulstaert (1900–1990), Belgian missionary in the Belgian Congo from 1925
 * Gustaaf van Hulstijn (1884–1976), Dutch fencer
 * Gustaaf Willem van Imhoff (1705–1750), Dutch colonial administrator for the Dutch East India Company
 * Gustaaf Joos (1923–2004), prelate of the Diocese of Ghent
 * Julius Gustaaf Arnout Koenders (1886–1957), Surinamese teacher and fervent activist for Sranan Tongo
 * Gustaaf Lauwereins (born 1941), Belgian judoka
 * Adolf Gustaaf Lembong (1910–1950), Indonesian military officer involved in guerrilla warfare against Japan in the Philippines during World War II
 * Gustaaf Adolf Maengkom (1907–1984), former Indonesian Minister of Justice in the Djuanda Cabinet and Indonesian ambassador to Poland
 * Gustaaf Adolf Frederik Molengraaff (1860–1942), Dutch geologist, biologist and explorer
 * Gustaaf Martinus Oosterling (1873–1928), early Surinamese photographer
 * Gustaaf Pelsmaecker or Auguste Pelsmaeker (1899–1976), Belgian footballer
 * Gustaaf Van Roosbroeck (born 1948), Belgian professional road bicycle racer
 * Gustaaf Sap or Gustave Sap (1886–1940), Belgian politician and minister for the Catholic Party
 * Gustaaf Schlegel (1840–1903), Dutch sinologist and field naturalist
 * Gustaaf Segers (1848–1930), Flemish writer, Dutch and German teacher and Vondel scholar
 * Gustaaf Van Slembrouck (1902–1968), Belgian professional cyclist from 1926 to 1934, nicknamed 'Den Staf'
 * Gustaaf De Smet (1935–2020), Belgian cyclist
 * Gustaaf Sorel (1905–1981), Belgian painter and draughtsman
 * Gustaaf Uhlenbeek (born 1970), Dutch former footballer
 * Gustaaf Wappers (1803–1874), Belgian painter