Princess Louise of Thurn and Taxis (German: Luisa Mathilde Wilhelmine Marie Maximiliane, Prinzessin von Thurn und Taxis; 1 June 1859 – 20 June 1948) was the eldest child of Maximilian Anton, Hereditary Prince of Thurn and Taxis and Duchess Helene in Bavaria.

Louise was the eldest child[citation needed] of Maximilian Anton, Hereditary Prince of Thurn and Taxis and his wife Duchess Helene in Bavaria.

Louise married Prince Frederick of Hohenzollern-Sigmaringen, fifth child and youngest son of Karl Anton, Prince of Hohenzollern and his wife Princess Josephine of Baden, on 21 June 1879 in Regensburg.

Marie of Romania, who married her nephew-by-marriage, wrote in her memoirs: "Tantchen," his thin, active, talkative little wife, was more militant and showed scant patience with either Uncle or Aunty.

Both her elderly sisters-in-law exasperated her, Fiirstin Antonia as well as Carmen Sylva; I am afraid that she even occasionally called them "humbugs" and was not disinclined to be in sympathy with the younger generation when they allowed themselves to criticize their betters.