Sonia
Sonia, Sonja or Sonya, a name of Greek origin meaning wisdom, may refer to:

People
Sonia (name), a feminine given name (lists people named, Sonia, Sonja and Sonya)
Sonia (actress), Indian film actress in Malayalam and Tamil films
Sonia (singer), British pop singer Sonia Evans
Sonia, pen name of Ottavia Vitagliano (1894–1975), an Italian writer
Sonia, code-name of Ursula Kuczynski, also known as Beurton, a spy for the USSR
Queen Sonja of Norway (born 1937)
Sonia Ben Ammar, French fashion model, actress and singer known mononymously as SONIASonia people, an ethnic group on the Great Papuan Plateau of Papua New Guinea

Other
Sonia, the allied code name for the Mitsubishi Ki-51, Japanese WW2 era bomber
SONIA, Sterling OverNight Index Average, a financial market rate
Sonia (album), a 1991 album by Sonia Evans
Sonia (film), a 1921 British silent film
Sonja (film), a 1943 Swedish directed by Hampe Faustman
Sonia (genus), a genus of moths
M/V Sonia, a passenger ferry