Christiana or Christianna is a feminine given name.
Notable people with the name include:
Christiana Figueres (born 1956), Costa Rican diplomat
Christianna Brand (1907–1988), British crime writer and children's author
Christiana Cavendish (1595–1675), Scottish landowner and royalist
Christiana Mariana von Ziegler (1695–1760), German poet and writer
Christiana of Schleswig-Holstein-Sonderburg-Glücksburg (1634–1701), often referred to as Christiane
Christiana Oxenstierna (1661–1701), Swedish noble
In fiction:
Christiana, wife of Christian in The Pilgrim's Progress