| Subdivision Type: | Country |
| Pushpin Map: | Hungary |
| Timezone: | CET |
| Utc Offset: | +1 |
| Timezone Dst: | CEST |
| Utc Offset Dst: | +2 |
| Official Name: | Nagyecsed |
| Government Footnotes: | [1] |
| Leader Name: | Kovács Lajos |
| Leader Title: | Mayor |
| Leader Party: | Independent |
| Subdivision Type1: | County |
| Subdivision Name1: | Szabolcs-Szatmár-Bereg |
| Area Footnotes: | [2] |
| Area Total Km2: | 43.85 |
| Population Footnotes: | [3] |
| Population As Of: | 2022 |
| Population Total: | 5927 |
| Population Density Km2: | auto |
| Postal Code Type: | Postal code |
| Postal Code: | 4355 |
| Area Code: | 44 |
Nagyecsed is a town in Szabolcs-Szatmár-Bereg county, in the Northern Great Plain region of eastern Hungary.
The old name of the town was Ecsed but over time it has been renamed Nagyecsed, meaning "grand" or "great Ecsed" to distinguish it. The area had close associations with a cadet branch of the Báthory family. Elizabeth Báthory was raised in the town's now ruined castle. Her main residence and later her prison was Csejte Castle, Upper Hungary, now in Slovakia, but she was buried in the family crypt at Ecsed.
The town's castle was demolished in the eighteenth century after the Kuruc uprisings.
It covers an area of 43.850NaN0 and has a population of 5,927 people (2022).
The town is divided in two by the Crasna River. It formerly lay north west of the Ecsed Marsh (Ecsedi-láp), which was the largest contiguous marshland of the Great Hungarian Plain. As part of water control operations by Tibor Károlyi this was drained in the late nineteenth century, and the lands thus reclaimed transformed into farmland.