| Marco Torlonia | |
| Prince of Civitella-Cesi | |
| Full Name: | Marco Alfonso Torlonia |
| Birth Date: | 2 July 1937 |
| Birth Place: | Italy |
| Death Place: | Italy |
| Father: | Don Alessandro Torlonia, 5th Prince of Civitella-Cesi |
| House: | Torlonia |
| Mother: | Infanta Beatriz of Spain |
| Spouse: | Donna Orsetta Caracciolo (m. 1960, died 1968) Blažena Anna Helena Svitáková (m. 1975) |
| Issue: | Don Giovanni Torlonia, 7th Prince of Civitella-Cesi Donna Vittoria Eugenia Colonna Donna Caterina d'Albora |
Don Marco Alfonso Torlonia, 6th Prince of Civitella-Cesi (2 July 1937 – 5 December 2014)[1] was the son of Alessandro Torlonia, 5th Prince of Civitella-Cesi and Infanta Beatriz of Spain, daughter of King Alfonso XIII of Spain.[2] He was, therefore, the first cousin to King Juan Carlos I of Spain. He was also an uncle to Princess Sibilla of Luxembourg, daughter of his younger sister, Olimpia.
He married firstly Donna Orsetta Caracciolo, dei Duchi di Melito dei Principi di Castagneto (17 May 1940 – 10 March 1968) on 16 September 1960 (marriage dissolved by her death in 1968). They have one son and two grandchildren:
He married secondly Philippa McDonald on 9 November 1968 (marriage dissolved by divorce in 1975). They have one daughter:
He married thirdly Blažena Svitáková on 11 November 1985. They have one daughter and two grandsons: