Prince Karl Aloys of Liechtenstein (in German: Karl Aloys von und zu Liechtenstein) (born 16 September 1878 at Frauenthal; died 20 June 1955 at Frauenthal) was Imperial and Royal Cavalry Master (Rittmeister) until the end of the monarchy of Austria-Hungary and from 13 December 1918 to 15 September 1920 temporarily Prime Minister (Landesverweser) of the Principality of Liechtenstein.