| Lajos Simonyi | |
| Order: | Minister of Agriculture, Industry and Trade of Hungary |
| Term Start: | 11 March 1875 |
| Term End: | 21 August 1876 |
| Predecessor: | György Bartal |
| Successor: | Ágoston Trefort |
| Birth Date: | 1824 4, df=yes |
| Birth Place: | Ternopil, Austrian Empire |
| Death Place: | Budapest, Austria-Hungary |
| Profession: | politician |
| Party: | Left Centre, Liberal Party |
Baron Lajos Simonyi de Barbács et Vitézvár (13 April 1824 – 12 December 1894) was a Hungarian politician, who served as Minister of Agriculture, Industry and Trade between 1875 and 1876. He studied law in Kassa. From 1847 he was a delegate on the Diet in Pest. He participated in the Hungarian Revolution of 1848, he performed courier service besides Artúr Görgey. As a result, he was imprisoned for a short time. Later he was a supporter of László Teleki. Simonyi retired from politics in 1878.