Tiiu

Tiiu is an Estonian feminine given name and may refer to:
 * Tiiu Aro (born 1952), Estonian physician and politician
 * Tiiu Asper (born 1983), Estonian judoka
 * Tiiu Erelt (born 1942), Estonian linguist
 * Tiiu Kera (born 1945), retired United States Air Force major general
 * Tiiu Kirsipuu (born 1957), Estonian sculptor
 * Tiiu Kuik (born 1987), Estonian fashion model
 * Tiiu Kull (born 1958), Estonian botanist
 * Tiiu Levald (born 1940), Estonian opera singer, pedagogue and music critic
 * Tiiu Märss (born 1943), Estonian geologist and paleontologist
 * Tiiu Parmas (1943–2011), Estonian tennis player
 * Tiiu Nurmberg (born 1982), Canadian-Estonian alpine skier