| Ermengarde of Tours | |
| Succession: | Empress of the Carolingian Empire |
| Reign: | October 821 – 20 Mar 851 |
| Birth Date: | c. 810 |
| Death Date: | 20 March 851 (aged 40- 41) |
| Death Place: | Erstein, France |
| Consort: | yes |
| Spouse: | Lothair I |
| Issue: | Louis II of Italy Helletrud Bertha Ermengarde Gisla Lothair II Rotrud Charles of Provence |
| House: | Etichonids |
| Father: | Hugh of Tours |
| Mother: | Ava |
| Succession1: | Queen consort of Italy |
| Reign1: | October 821 – 20 Mar 851 |
| Succession2: | Queen consort of Middle Francia |
| Reign2: | August 843 – 20 Mar 851 |
Ermengarde of Tours (c. 810 - 20 Mar 851) was daughter of Hugh of Tours and Ava of Morvois.
In October 821 in Thionville, Ermengarde married the Carolingian Emperor Lothair I of the Franks (795–855).
Ermengarde used her bridal gift to found the abbey Erstein in the Elsass, in which she is buried. Ermengarde died in 851.
Lothair and Ermengarde had:
The contemporary poet Sedulius Scottus wrote "Men despise the zither's harmonious music whenever they hear your angelic and golden voice... Your face shines like ivory and blushes like a rose, and excels the beauty of Venus and the nymphs. A dazzling crown of golden hair adorns you, and splendid topaz, as a glittering diadem... Your milk-white neck glistens with beauty, ahining with the lustre of lilies or ivory. Your soft white hands dispense myriad gifts, whence they sow on earth to reap in heaven.[1]