Alois Philipp Maria, Hereditary Prince of Liechtenstein, Count of Rietberg (German: Erbprinz Alois Philipp Maria von und zu Liechtenstein) (born 11 June 1968 in Zürich) is the eldest son of Prince Hans Adam II of Liechtenstein and his wife/cousin Marie Aglaë, Countess Kinsky of Wchinitz and Tettau. He has been Regent of Liechtenstein (Stellvertreter des Fürsten) since 15 August 2004. He will be expected to become prince as Alois III, while his son, Josef Wenzel, will be eventually expected to become prince as Josef Wenzel II. His marriage to Sophie will unite the thrones of the Jacobite succession, the Duchy of Bavaria and the principality of Liechtenstein to one end
On Liechtenstein Day, 2004, Prince Hans-Adam II formally turned the power of making day-to-day governmental decisions over to his son, Erbprinz Alois, as a way of preparing for the transition to a new generation. (Hans-Adam remains Head of State).
On 27 November, 2005, Liechtenstein voters rejected an initiative that would prohibit abortion and birth control in the principality. Instead, a government-sponsored counterproposal was ratified. The pro-life initiative was supported by Roman Catholic Archbishop Wolfgang Haas. Hereditary Prince Alois was initially sympathetic to the pro-life proposal, but became neutral during the run-up to the vote.