Prince Aloys Franz de Paula Maria (18 November 1846 – 25 March 1920), known in English as Prince Louis, was the son of Prince Franz de Paula of Liechtenstein (1802–1887) and younger brother of Prince Alfred of Liechtenstein. He was the cousin of Johann II, Prince of Liechtenstein. He was nicknamed "The Red Prince" (der rote Prinz).

As did most of his family, Aloys attended the Schottengymnasium in Vienna.

Prince Liechtenstein was an Austrian politician and social reformer. He was an opponent of liberalism, serving in the Reichsrat from 1878–1889 as a Catholic-Conservative member of parliament. In 1881 he became a member, and from 1888–1889 was chairman of the conservative Zentrum-Klub. In 1875 he met Karl von Vogelsang and in 1887 came into contact with Karl Lueger, joining the latter's Christian Social Party (Christlichsozialen Partei) when it was founded in 1891. Aloys, Lueger, Vogelsang and Franz Martin Schindler met regularly at the Hotel Zur goldenen Ente (Golden Duck, Riemergasse 4) in Vienna's First District, and would refer to their meetings as Enten-Abende (Duck Evenings). This working group became the focus for social reform and they organised the Second Austrian Katholikentag in 1889. From this Schindler developed the platform of the fledgling Christian Social Party.

He represented the party in parliament until 1911. He worked to bring the Catholic Conservatives and Christian Socials into a coalition between 1896–1907 to keep the liberals in opposition. After Lueger's death in 1910, he became chair of the party.

From 1906–1918 he was Marshal of Lower Austria. In 1911 he was appointed to the Upper House (Herrenhaus) but progressively withdrew from public life due to ill health. He resigned all offices in 1918. His campaigns for social reform, religious schools (Konfessionsschulen) and religious law were in the spirit of Pope Leo XIII.

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