| Georges Theunis | |
| Office: | Prime Minister of Belgium |
| Term Start: | 20 November 1934 |
| Term End: | 25 March 1935 |
| Predecessor: | Charles de Broqueville |
| Successor: | Paul van Zeeland |
| Monarch2: | Albert I |
| Term Start2: | 16 December 1921 |
| Term End2: | 13 May 1925 |
| Predecessor2: | Henri Carton de Wiart |
| Successor2: | Aloys Van de Vyvere |
| Office3: | Governor of the National Bank of Belgium |
| Term Start3: | 1941 |
| Term End3: | 1944 |
| Predecessor3: | Albert Goffin |
| Successor3: | Maurice Frère |
| Birth Date: | 28 February 1873 |
| Birth Place: | Montegnée, Belgium |
| Death Place: | Brussels, Belgium |
| Party: | Catholic Party |
Georges (George) Emile Léonard Theunis (28 February 1873 – 4 January 1966) was the prime minister of Belgium from 16 December 1921 to 13 May 1925 and again from 20 November 1934 to 25 March 1935. He was governor of the National Bank of Belgium (NBB) in exile in London, from 1941 until 1944. He was also the minister of Finance from 1920 to 1925.
Theunis received military training and was also trained as an engineer. Georges Theunis started his career in the Empain group, where he was an administrator and later the president of the board of ACEC. During World War I, he headed the Belgian Wartime Provisions Commission in London. After the war he was involved in the Paris Peace Conference, in 1919 and served as the Belgian delegate to the Reparations Commission. In May 1927 he chaired the World Economic Conference in Geneva.
In 1926 Theunis joined the newly formed council of Regency of the National Bank, together with Emile Francqui, and remained a member until the war, except for two breaks during his ministerial duties. As regents of the NBB, both Theunis and Francqui represented the power which the large private banks had gained since 1926. During World War II he served as a special ambassador to the United States of America. In 1941, he was appointed governor of the National Bank of Belgium by the Pierlot government in exile at London instead of Albert Goffin who had been appointed by Secretary General Charles Plisnier. On his return to Belgium after the war, he resigned as governor of the NBB.
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