Adelaide of Austria (Adelheid Franziska Marie Rainera Elisabeth Clotilde; 3 June 1822 – 20 January 1855) was Queen of Sardinia by marriage to Victor Emmanuel II of Sardinia, future King of Italy, from 1849 until 1855 when she died as a result of gastroenteritis.

She was born at the Royal Palace of Milan to Archduke Rainer Joseph of Austria and his wife Princess Elisabeth of Savoy.

The marriage was used to cement relations between the Houses of Savoy and Habsburg, but was seen by many at the time as increasing Austrian power in Italy.

Prince Victor Emmanuel was the heir to his father King Charles Albert of Sardinia.

Her mother-in-law, Maria Theresa of Austria, retained great influence over her son throughout his life.

Another story says that Adelaide died of her burns after stepping on a match that set fire to her clothes.