Prince Johannes Heinrich of Saxe-Coburg and Gotha (Johannes Heinrich Friedrich Werner Konrad Rainer Maria; Slovak: Ján Henrich, Hungarian: János Henrik; 28 March 1931, in Innsbruck – 14 April 2010, in Innsbruck) was a prince of the House of Saxe-Coburg and Gotha-Koháry and the last holder of Csábrág and Szitnya, both in modern-day Slovakia, lost to the communist regime of Czechoslovakia. He was the only son of Prince Rainer of Saxe-Coburg and Gotha by his first wife, Johanna Károlyi de Károly-Patty.

In Munich on 24 October 1957, Johannes Heinrich married, firstly, Baroness Gabrielle von Fürstenberg. They had one daughter:

Johannes Heinrich and Gabrielle were divorced on 4 July 1968. Four months later, in Munich on 12 November 1968, Johannes Heinrich married, secondly, Princess Mathilde of Saxony, a medical doctor and granddaughter of King Frederick Augustus III of Saxony. They had one son:

Johannes Heinrich and Mathilde divorced on 27 August 1993. Johannes Heinrich also had an illegitimate daughter named Christine Johanna Wieser (b. 29 March 1968 in Innsbruck) with Dr. Med. Edda Wieser (6. November 1940 - 16. December 1996).

After the death of Johannes Heinrich, the heir to the House of Saxe-Coburg-Gotha-Koháry is the former King Simeon II of Bulgaria, due to the exclusion of Johannes Heinrich's uncle Philipp Josias Maria Joseph Ignatius Michael Gabriel Raphael Gonzaga (Walterskirchen, 18 August 1901 – Vienna 31 Dec 1994), married morganatically on 23 April 1944 to Sarah Aurelia Halasz, and his descendants (their only son and four grandchildren were barred from the succession).

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