Prince Heinrich Ruzzo Reuss of Plauen

Heinrich Ruzzo Prinz Reuss von Plauen (; 24 May 1950 – 29 October 1999) was a Swiss-born Swedish landscape architect and a member of the formerly sovereign House of Reuss. His branch ruled the Principality of Reuss-Gera until 1918.

Although only a younger son of a minor royal family, when Heinrich XXVI married Countess Viktoria von Fürstenstein (1863–1949) in 1885, under the strict marriage rules then enforced by the Reuss dynasty their children were not allowed to bear the princely title, being designated "Counts of Plauen" instead, while still in the line of succession to the throne of Reuss

When the German Empire collapsed at the end of World War I, the reigning Prince Reuss lost his crown along with all the other monarchs whose realms were within Germany. In 1927, Heinrich XXVI's childless brother, Prince Heinrich XXX (1864–1939), adopted his nephew and the now-deposed dynasty agreed to accept him as "Prince Heinrich Harry Reuß", along with those of his male-line descendants born of unions complying with the family's 1902 rules that permitted marriages to countesses (Heinrich Harry's wife, Huberta von Tiele-Winckler was only a baroness in her own right, but belonged to a family of comital rank in Prussia).