| Alois-Konstantin | |
| Full Name: | German: Alois Konstantin Karl Eduard Joseph Johann Konrad Antonius Gerhard Georg Benediktus Pius Eusebius Maria |
| Reign: | 23 August 1990 - present |
| Reign-Type: | Tenure |
| Predecessor: | Charles II |
| Successor: | Nicodemus, Hereditary Prince of Löwenstein-Wertheim-Rosenberg |
| Suc-Type: | Heir apparent |
| Succession: | Prince of Löwenstein-Wertheim-Rosenberg |
| Issue: | Prince Carl Friedrich Prince Hubertus Princess Christina Prince Dominik |
| House: | Löwenstein-Wertheim-Rosenberg |
| Father: | Charles II |
| Mother: | Carolina dei Conti Rignon |
| Birth Date: | 16 December 1941 |
| Birth Place: | Würzburg, Bavaria, Nazi Germany |
| Religion: | Roman Catholic |
Alois-Konstantin, 9th Prince of Löwenstein-Wertheim-Rosenberg, full German name: Alois Konstantin Karl Eduard Joseph Johann Konrad Antonius Gerhard Georg Benediktus Pius Eusebius Maria, Fürst zu Löwenstein-Wertheim-Rosenberg (born 16 December 1941 in Würzburg, Bavaria) is a German businessman and, since 1990, the head of the mediatised House of Löwenstein-Wertheim-Rosenberg, the Catholic cadet line of the Princes of Löwenstein-Wertheim, itself the patrilineally senior but morganatic branch of the royal house of Wittelsbach, which ruled the Kingdom of Bavaria until 1918.
Alois was born in Würzburg, the fifth child and only son of Karl, Prince of Löwenstein-Wertheim-Rosenberg and his wife, Carolina dei Conti Rignon. He had four older sisters, Maria (wife of Joseph, Archduke of Austria), Josephine (wife of Alexander, Prince of Liechtenstein), Monika (wife of Don Jaime Mendez de Vigo y del Arco) and Christiane (wife of Michael, Archduke of Austria), and two younger sisters, Elisabeth-Alexandra (wife of José Maria Trénor y Suarez de Lezo) and Lioba (wife of Moritz Eugen, Prince of Oettingen-Oettingen and Oettingen-Wallerstein). He and his sisters spent their childhood in Bronnbach, and Alois attended school in Miltenberg.
Alois graduated with a degree in law from the University of Würzburg. After working for Gulf Oil in Pittsburgh, he was director of Merck Finck & Co and LGT Bank. He is a commander of the Order of the Holy Sepulchre, a knight of the Order of the Golden Fleece, and a board member of the Papal Foundation Centesimus Annus Pro Pontifice (CAPP). He also serves as the director of the Forum of German Catholics' Congress on Joy and Faith.
Alois married Anastasia (b. 14 February 1944, Brieg), the elder daughter of Prince Hubertus of Prussia, in a civil ceremony in 1965 in Bronnbach, and in a religious ceremony a month later in Erbach. The couple lives at Kleinheubach castle. They had four children:
His heir apparent is his grandson, Nicodemus, born 2 August 2001.