| Károly Szász | |
| Order: | Speaker of the House of Representatives |
| Term Start: | 3 July 1917 |
| Term End: | 16 November 1918 |
| Predecessor: | Pál Beőthy |
| Successor: | House of Representatives dissolved János Hock (Hungarian National Council) |
| Birth Date: | 11 November 1865 |
| Birth Place: | Szabadszállás, Austrian Empire |
| Death Date: | 21 March 1950 (aged 84) |
| Death Place: | Budapest, People's Republic of Hungary |
| Profession: | literary historian, politician |
| Party: | Party of National Work National Centre Party National Civic Party |
Károly Szász de Szemerja (11 November 1865 - 21 March 1950) was a Hungarian literary historian and politician, who served as the last Speaker of the House of Representatives between 1917 and 1918. He was a member of the Hungarian Academy of Sciences, Kisfaludy Society and Petőfi Society.
He strongly opposed Endre Ady's poetry, his study about the poet attracted attention in the country. After the Declaration of Eckartsau (Emperor-King Charles I (IV) suspended his royal rights) Mihály Károlyi and Szász dissolved the House of Representatives and proclaimed the Republic on 16 November 1918. Szász said "during the pivotal historical events which took place in the past few weeks, the Hungarian people despised the basis of a sovereign, independent and democratic Hungary." Károlyi became Provisional President and the Diet of Hungary was replaced by the Hungarian National Council.
Szász retired from the politics after declaration of the republic. During the time of the Hungarian Soviet Republic, he was held prisoner as a hostage.