|Princess de Ligne de La Trémoïlle|
|Born||2 December 1974|
|Spouse||Prince Edouard Lamoral de Ligne|
|Issue||Princess Althea de Ligne de la Trémoïlle|
Princess Athénaïs de Ligne de la Trémoïlle
Prince Antoine de Ligne de la Trémoïlle
|House||House of Ligne (by marriage)|
|Father||Mario Orsini |
|Princely family of Ligne|
Isabella Orsini, princesse de Ligne de La Trémoïlle (born 2 December 1974) is an Italian actress.
- Bagnomaria, directed by Giorgio Panariello (1998)
- Apri gli occhi e... sogna, directed by Rosario Errico (2002) – in the role of Cinzia
- Velocità massima, directed by Daniele Vicari (2002)
- Ricordati di me, directed by Gabriele Muccino (2003) – in the role of Lucia
- Modena Modena, by Daniele Malavolta (2003) – Opera prima
- Intrigo a Cuba, directed by Riccardo Leoni (2004) – filmed in 1999
- Zorba Il Buddha, directed by Lakshen Sucameli (2004) – in the role of Niko
- September Eleven 1683, directed by Renzo Martinelli (2012)
- Young Perez, directed by Jacques Ouaniche (2013)
- The Twins, directed by Lamberto Bava (2016)
- Il bello delle donne 2, directed by Gianni Dalla Porta, Luigi Parisi, Maurizio Ponzi and Giovanni Soldati – TV series – Canale 5 (2002)
- Il bello delle donne 3, directed by Maurizio Ponzi and Luigi Parisi – TV series – Canale 5 (2003)
- La palestra, directed by Pier Francesco Pingitore – TV miniseries – Canale 5 (2003)
- Luisa Sanfelice, directed by fratelli Taviani – TV miniseries – Rai Uno (2004)
- Imperia, la grande cortigiana, directed by Pier Francesco Pingitore – TV film – Canale 5 (2005)
- Caterina e le sue figlie, directed by Fabio Jephcott – TV miniseries – Canale 5 (2005)
- L'onore e il rispetto, directed by Salvatore Samperi – TV miniseries – Canale 5 (2007)
- Il sangue e la rosa, directed by Salvatore Samperi, Luigi Parisi and Luciano Odorisio – TV miniseries – Canale 5 (2008)
Orsini married in a civil ceremony on 2 September 2009 and in a religious ceremony on 5 September 2009, to Prince Édouard Lamoral Rodolphe de Ligne de La Trémoïlle (born 1976), at Antoing Castle in the Hainaut province of Belgium.
The couple's first child, Princess Althea Isabelle Sophie de Ligne de la Trémoïlle, was born on 12 May 2010 at the private "Villa Mafalda" clinic in Rome. On 9 May 2014, the couple had their second child, Princess Athénaïs Allegra Isabella de Ligne de la Trémoïlle at the American Hospital of Paris. On 10 January 2019, Orsini gave birth to the couple's third child, Prince Antoine Tau Édouard Adrien de Ligne de la Trémoïlle in Paris, France. 
As Belgium is a monarchy which confers and recognises hereditary titles of nobility, the right of Orsini and her Ligne la Trémoïlle children to the prefix of prince/ss and to the style of Highness is legal—not a courtesy title; all members of the House of Ligne have been entitled to princely rank and to the Altesse in Belgium since 31 May 1923.
- Modena Modena – Opera prima di Daniele Malavolta Archived 2004-11-20 at the Wayback Machine
- "Foto Matrimonio". Isabella Orsini. Archived from the original on 2013-06-18. Retrieved 2013-05-23.
- "Archived copy". Archived from the original on 2015-06-10. Retrieved 2013-03-03.CS1 maint: Archived copy as title (link)
- Genealogishes Handbuch des Adels: Furstliche Hauser Band XIV. Limburg an der Lahn, Germany: C.A. Starke Verlag. 1991. pp. 495, 498–499. ISBN 3-7980-0700-4.