Idalia may refer to:

Places
 Idalia, Queensland, suburb of Townsville, Queensland, Australia
 Idalia, Colorado, unincorporated community in Yuma County, Colorado, US
 Idalia, Missouri, unincorporated community in Stoddard County, Missouri, US
 Idalia Manor, historic home located at Mt. Pleasant, New Castle County, Delaware, US
 Idalia, a name of the ancient city of Idalium in Cyprus

People
 Sobriquet of Greek goddess Aphrodite
 Idalia Anreus (1932–1998), Cuban actress who worked in both theatre and film
 Idalia Gumbs (1933–2000), Anguillan politician
 Idalia Hechavarría (born 1974), Cuban sprinter

Other uses 

 Idalia (genus), genus of moths
 Hurricane Idalia, 2023 Atlantic Ocean tropical cyclone