Luise of Tuscany (2 September, 1870 Salzburg–23 March, 1947) was born in Salzburg under the name Luise Antoinette Maria Theresia Josepha Johanna Leopoldine Caroline Ferdinande Alice Ernestine Habsburg, Princess Imperial and Archduchess of Austria, Princess of Hungary and Bohemia, Princess of Tuscany. She was the daughter of Ferdinand IV of Tuscany and his second wife Alicia of Bourbon-Parma .

On 21 November 1891 she married Frederik Augustus of Saxony in Vienna. She was very popular in Saxony. She didn't follow the etiquette at the court which resulted in arguments with her father in law. On 9 December 1902 she left the Saxony without her children but pregnant. For a while she lived with the teacher of her children, André Giron.

She was divorced 11 February 1903. Her last child from Friedrich August was sent to Dresden to live at the court.

She was created Countess of Montignoso.

On 25 September 1907 she married the Musician Enrico Toselli in London. They where divorced five years later.

She died in Brussels and her urn is in Sigmaringen.

Children from Friedrich August III

• Friedrich August Georg, Crown Prince, Priest (1893- 1943)
• Friedrich Christian, Margrave of Meissen, Duke of Saxony (1893-1968)
• Ernst Heinrich, Prince of Saxony (1896 - 1971)
• Maria Alix Carola, stillborn 22 August 1898
• Margarete Carola Wilhelmine (1900 - 1962)
• Maria Alix Luitpolda (1901 - 1990)
• Anna Pia Monika (1903 - 1976)

Children from Enrico Toselli

• Carlo Emanuele Toselli *7 May 1908 - 1969